diff --git a/src/AMOEBA/angle_amoeba.cpp b/src/AMOEBA/angle_amoeba.cpp
index 3b937568ff..e2d26dd047 100644
--- a/src/AMOEBA/angle_amoeba.cpp
+++ b/src/AMOEBA/angle_amoeba.cpp
@@ -623,7 +623,7 @@ void AngleAmoeba::allocate()
 
 void AngleAmoeba::coeff(int narg, char **arg)
 {
-  if (narg < 2) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (narg < 2) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo,ihi;
@@ -632,7 +632,7 @@ void AngleAmoeba::coeff(int narg, char **arg)
   int count = 0;
 
   if (strcmp(arg[1],"ba") == 0) {
-    if (narg != 6) error->all(FLERR,"Incorrect args for angle coefficients");
+    if (narg != 6) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 
     double ba_k1_one = utils::numeric(FLERR,arg[2],false,lmp);
     double ba_k2_one = utils::numeric(FLERR,arg[3],false,lmp);
@@ -649,7 +649,7 @@ void AngleAmoeba::coeff(int narg, char **arg)
     }
 
   } else if (strcmp(arg[1],"ub") == 0) {
-    if (narg != 4) error->all(FLERR,"Incorrect args for angle coefficients");
+    if (narg != 4) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 
     double ub_k_one = utils::numeric(FLERR,arg[2],false,lmp);
     double ub_r0_one = utils::numeric(FLERR,arg[3],false,lmp);
@@ -662,7 +662,7 @@ void AngleAmoeba::coeff(int narg, char **arg)
     }
 
   } else {
-    if (narg != 9) error->all(FLERR,"Incorrect args for angle coefficients");
+    if (narg != 9) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 
     int pflag_one = utils::inumeric(FLERR,arg[1],false,lmp);
     int ubflag_one = utils::inumeric(FLERR,arg[2],false,lmp);
@@ -689,7 +689,7 @@ void AngleAmoeba::coeff(int narg, char **arg)
     }
   }
 
-  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 
   for (int i = ilo; i <= ihi; i++)
     if (setflag_a[i] == 1 && setflag_ba[i] == 1 && setflag_ub[i])
diff --git a/src/CG-SPICA/angle_spica.cpp b/src/CG-SPICA/angle_spica.cpp
index 913428cd9b..08e4217483 100644
--- a/src/CG-SPICA/angle_spica.cpp
+++ b/src/CG-SPICA/angle_spica.cpp
@@ -249,7 +249,7 @@ void AngleSPICA::allocate()
 void AngleSPICA::coeff(int narg, char **arg)
 {
   if ((narg < 3) || (narg > 6))
-    error->all(FLERR,"Incorrect args for angle coefficients");
+    error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 
   if (!allocated) allocate();
 
@@ -270,7 +270,7 @@ void AngleSPICA::coeff(int narg, char **arg)
     if (repscale_one > 0.0) repscale_one = 1.0;
   } else if (narg == 4) repscale_one = utils::numeric(FLERR,arg[3],false,lmp);
   else if (narg == 3) repscale_one = 1.0;
-  else error->all(FLERR,"Incorrect args for angle coefficients");
+  else error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 
   // convert theta0 from degrees to radians and store coefficients
 
@@ -283,7 +283,7 @@ void AngleSPICA::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/CLASS2/angle_class2.cpp b/src/CLASS2/angle_class2.cpp
index 5000f9f629..04b7a9238c 100644
--- a/src/CLASS2/angle_class2.cpp
+++ b/src/CLASS2/angle_class2.cpp
@@ -272,7 +272,7 @@ void AngleClass2::allocate()
 
 void AngleClass2::coeff(int narg, char **arg)
 {
-  if (narg < 2) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (narg < 2) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo,ihi;
@@ -281,7 +281,7 @@ void AngleClass2::coeff(int narg, char **arg)
   int count = 0;
 
   if (strcmp(arg[1],"bb") == 0) {
-    if (narg != 5) error->all(FLERR,"Incorrect args for angle coefficients");
+    if (narg != 5) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 
     double bb_k_one = utils::numeric(FLERR,arg[2],false,lmp);
     double bb_r1_one = utils::numeric(FLERR,arg[3],false,lmp);
@@ -296,7 +296,7 @@ void AngleClass2::coeff(int narg, char **arg)
     }
 
   } else if (strcmp(arg[1],"ba") == 0) {
-    if (narg != 6) error->all(FLERR,"Incorrect args for angle coefficients");
+    if (narg != 6) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 
     double ba_k1_one = utils::numeric(FLERR,arg[2],false,lmp);
     double ba_k2_one = utils::numeric(FLERR,arg[3],false,lmp);
@@ -313,7 +313,7 @@ void AngleClass2::coeff(int narg, char **arg)
     }
 
   } else {
-    if (narg != 5) error->all(FLERR,"Incorrect args for angle coefficients");
+    if (narg != 5) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 
     double theta0_one = utils::numeric(FLERR,arg[1],false,lmp);
     double k2_one = utils::numeric(FLERR,arg[2],false,lmp);
@@ -332,7 +332,7 @@ void AngleClass2::coeff(int narg, char **arg)
     }
   }
 
-  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 
   for (int i = ilo; i <= ihi; i++)
     if (setflag_a[i] == 1 && setflag_bb[i] == 1 && setflag_ba[i] == 1)
diff --git a/src/DIPOLE/angle_dipole.cpp b/src/DIPOLE/angle_dipole.cpp
index a66f3e1042..530f23f844 100644
--- a/src/DIPOLE/angle_dipole.cpp
+++ b/src/DIPOLE/angle_dipole.cpp
@@ -160,7 +160,7 @@ void AngleDipole::allocate()
 
 void AngleDipole::coeff(int narg, char **arg)
 {
-  if (narg != 3) error->all(FLERR, "Incorrect args for angle coefficients");
+  if (narg != 3) error->all(FLERR, "Incorrect args for angle coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo, ihi;
@@ -179,7 +179,7 @@ void AngleDipole::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/EXTRA-MOLECULE/angle_cosine_periodic.cpp b/src/EXTRA-MOLECULE/angle_cosine_periodic.cpp
index 6aae8d3ff4..e0e7f31f39 100644
--- a/src/EXTRA-MOLECULE/angle_cosine_periodic.cpp
+++ b/src/EXTRA-MOLECULE/angle_cosine_periodic.cpp
@@ -201,7 +201,7 @@ void AngleCosinePeriodic::allocate()
 
 void AngleCosinePeriodic::coeff(int narg, char **arg)
 {
-  if (narg != 4) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (narg != 4) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo,ihi;
@@ -210,7 +210,7 @@ void AngleCosinePeriodic::coeff(int narg, char **arg)
   double c_one = utils::numeric(FLERR,arg[1],false,lmp);
   int b_one = utils::inumeric(FLERR,arg[2],false,lmp);
   int n_one = utils::inumeric(FLERR,arg[3],false,lmp);
-  if (n_one <= 0) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (n_one <= 0) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 
   int count = 0;
   for (int i = ilo; i <= ihi; i++) {
@@ -221,7 +221,7 @@ void AngleCosinePeriodic::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 }
 
 /* ---------------------------------------------------------------------- */
diff --git a/src/EXTRA-MOLECULE/angle_cosine_shift.cpp b/src/EXTRA-MOLECULE/angle_cosine_shift.cpp
index 53ecb35eaf..14640a5e12 100644
--- a/src/EXTRA-MOLECULE/angle_cosine_shift.cpp
+++ b/src/EXTRA-MOLECULE/angle_cosine_shift.cpp
@@ -172,7 +172,7 @@ void AngleCosineShift::allocate()
 
 void AngleCosineShift::coeff(int narg, char **arg)
 {
-  if (narg != 3) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (narg != 3) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo,ihi;
@@ -194,7 +194,7 @@ void AngleCosineShift::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 }
 
 /* ---------------------------------------------------------------------- */
diff --git a/src/EXTRA-MOLECULE/angle_cosine_shift_exp.cpp b/src/EXTRA-MOLECULE/angle_cosine_shift_exp.cpp
index acca92c48e..185adea37d 100644
--- a/src/EXTRA-MOLECULE/angle_cosine_shift_exp.cpp
+++ b/src/EXTRA-MOLECULE/angle_cosine_shift_exp.cpp
@@ -200,7 +200,7 @@ void AngleCosineShiftExp::allocate()
 
 void AngleCosineShiftExp::coeff(int narg, char **arg)
 {
-  if (narg != 4) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (narg != 4) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo,ihi;
@@ -225,7 +225,7 @@ void AngleCosineShiftExp::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 }
 
 /* ---------------------------------------------------------------------- */
diff --git a/src/EXTRA-MOLECULE/angle_cosine_squared_restricted.cpp b/src/EXTRA-MOLECULE/angle_cosine_squared_restricted.cpp
index c6d78ea133..37003b5b05 100644
--- a/src/EXTRA-MOLECULE/angle_cosine_squared_restricted.cpp
+++ b/src/EXTRA-MOLECULE/angle_cosine_squared_restricted.cpp
@@ -166,7 +166,7 @@ void AngleCosineSquaredRestricted::allocate()
 
 void AngleCosineSquaredRestricted::coeff(int narg, char **arg)
 {
-  if (narg != 3) error->all(FLERR, "Incorrect args for angle coefficients");
+  if (narg != 3) error->all(FLERR, "Incorrect args for angle coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo, ihi;
@@ -185,7 +185,7 @@ void AngleCosineSquaredRestricted::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients" + utils::errorurl(21));
 }
 
 /* ---------------------------------------------------------------------- */
diff --git a/src/EXTRA-MOLECULE/angle_fourier.cpp b/src/EXTRA-MOLECULE/angle_fourier.cpp
index abcda6d036..f6cd9f4c80 100644
--- a/src/EXTRA-MOLECULE/angle_fourier.cpp
+++ b/src/EXTRA-MOLECULE/angle_fourier.cpp
@@ -174,7 +174,7 @@ void AngleFourier::allocate()
 
 void AngleFourier::coeff(int narg, char **arg)
 {
-  if (narg != 5) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (narg != 5) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo,ihi;
@@ -195,7 +195,7 @@ void AngleFourier::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 }
 
 /* ---------------------------------------------------------------------- */
diff --git a/src/EXTRA-MOLECULE/angle_fourier_simple.cpp b/src/EXTRA-MOLECULE/angle_fourier_simple.cpp
index 143a008039..e3497b5e81 100644
--- a/src/EXTRA-MOLECULE/angle_fourier_simple.cpp
+++ b/src/EXTRA-MOLECULE/angle_fourier_simple.cpp
@@ -191,7 +191,7 @@ void AngleFourierSimple::allocate()
 
 void AngleFourierSimple::coeff(int narg, char **arg)
 {
-  if (narg != 4) error->all(FLERR, "Incorrect args for angle coefficients");
+  if (narg != 4) error->all(FLERR, "Incorrect args for angle coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo, ihi;
@@ -210,7 +210,7 @@ void AngleFourierSimple::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients" + utils::errorurl(21));
 }
 
 /* ---------------------------------------------------------------------- */
diff --git a/src/EXTRA-MOLECULE/angle_gaussian.cpp b/src/EXTRA-MOLECULE/angle_gaussian.cpp
index 004fdd15ab..1272ada0bb 100644
--- a/src/EXTRA-MOLECULE/angle_gaussian.cpp
+++ b/src/EXTRA-MOLECULE/angle_gaussian.cpp
@@ -236,7 +236,7 @@ void AngleGaussian::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients" + utils::errorurl(21));
 }
 
 /* ---------------------------------------------------------------------- */
diff --git a/src/EXTRA-MOLECULE/angle_mwlc.cpp b/src/EXTRA-MOLECULE/angle_mwlc.cpp
index 1a1549fea6..804627cfa3 100644
--- a/src/EXTRA-MOLECULE/angle_mwlc.cpp
+++ b/src/EXTRA-MOLECULE/angle_mwlc.cpp
@@ -174,7 +174,7 @@ void AngleMWLC::allocate()
 
 void AngleMWLC::coeff(int narg, char **arg)
 {
-  if (narg != 5) error->all(FLERR, "Incorrect args for angle coefficients");
+  if (narg != 5) error->all(FLERR, "Incorrect args for angle coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo, ihi;
@@ -195,7 +195,7 @@ void AngleMWLC::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients" + utils::errorurl(21));
 }
 
 /* ---------------------------------------------------------------------- */
diff --git a/src/EXTRA-MOLECULE/angle_quartic.cpp b/src/EXTRA-MOLECULE/angle_quartic.cpp
index 616c81c749..92e84e79a5 100644
--- a/src/EXTRA-MOLECULE/angle_quartic.cpp
+++ b/src/EXTRA-MOLECULE/angle_quartic.cpp
@@ -183,7 +183,7 @@ void AngleQuartic::allocate()
 
 void AngleQuartic::coeff(int narg, char **arg)
 {
-  if (narg != 5) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (narg != 5) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo,ihi;
@@ -206,7 +206,7 @@ void AngleQuartic::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 }
 
 /* ---------------------------------------------------------------------- */
diff --git a/src/LEPTON/angle_lepton.cpp b/src/LEPTON/angle_lepton.cpp
index 6efded950f..4907086ab1 100644
--- a/src/LEPTON/angle_lepton.cpp
+++ b/src/LEPTON/angle_lepton.cpp
@@ -298,7 +298,7 @@ void AngleLepton::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients" + utils::errorurl(21));
 }
 
 /* ---------------------------------------------------------------------- */
diff --git a/src/MOFFF/angle_class2_p6.cpp b/src/MOFFF/angle_class2_p6.cpp
index f2667fb17b..d7cedb0bcf 100644
--- a/src/MOFFF/angle_class2_p6.cpp
+++ b/src/MOFFF/angle_class2_p6.cpp
@@ -279,7 +279,7 @@ void AngleClass2P6::allocate()
 
 void AngleClass2P6::coeff(int narg, char **arg)
 {
-  if (narg < 2) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (narg < 2) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo,ihi;
@@ -288,7 +288,7 @@ void AngleClass2P6::coeff(int narg, char **arg)
   int count = 0;
 
   if (strcmp(arg[1],"bb") == 0) {
-    if (narg != 5) error->all(FLERR,"Incorrect args for angle coefficients");
+    if (narg != 5) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 
     double bb_k_one = utils::numeric(FLERR,arg[2],false,lmp);
     double bb_r1_one = utils::numeric(FLERR,arg[3],false,lmp);
@@ -303,7 +303,7 @@ void AngleClass2P6::coeff(int narg, char **arg)
     }
 
   } else if (strcmp(arg[1],"ba") == 0) {
-    if (narg != 6) error->all(FLERR,"Incorrect args for angle coefficients");
+    if (narg != 6) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 
     double ba_k1_one = utils::numeric(FLERR,arg[2],false,lmp);
     double ba_k2_one = utils::numeric(FLERR,arg[3],false,lmp);
@@ -320,7 +320,7 @@ void AngleClass2P6::coeff(int narg, char **arg)
     }
 
   } else {
-    if (narg != 7) error->all(FLERR,"Incorrect args for angle coefficients");
+    if (narg != 7) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 
     double theta0_one = utils::numeric(FLERR,arg[1],false,lmp);
     double k2_one = utils::numeric(FLERR,arg[2],false,lmp);
@@ -343,7 +343,7 @@ void AngleClass2P6::coeff(int narg, char **arg)
     }
   }
 
-  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 
   for (int i = ilo; i <= ihi; i++)
     if (setflag_a[i] == 1 && setflag_bb[i] == 1 && setflag_ba[i] == 1)
diff --git a/src/MOFFF/angle_cosine_buck6d.cpp b/src/MOFFF/angle_cosine_buck6d.cpp
index e1f5f54bf6..bf7390a6f8 100644
--- a/src/MOFFF/angle_cosine_buck6d.cpp
+++ b/src/MOFFF/angle_cosine_buck6d.cpp
@@ -248,7 +248,7 @@ void AngleCosineBuck6d::allocate()
 
 void AngleCosineBuck6d::coeff(int narg, char **arg)
 {
-  if (narg != 4) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (narg != 4) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo,ihi;
@@ -257,7 +257,7 @@ void AngleCosineBuck6d::coeff(int narg, char **arg)
   double c_one = utils::numeric(FLERR,arg[1],false,lmp);
   int n_one = utils::inumeric(FLERR,arg[2],false,lmp);
   int th0_one = utils::numeric(FLERR,arg[3],false,lmp);
-  if (n_one <= 0) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (n_one <= 0) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 
 
   int count = 0;
@@ -271,7 +271,7 @@ void AngleCosineBuck6d::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/MOLECULE/angle_charmm.cpp b/src/MOLECULE/angle_charmm.cpp
index 11b5abd699..92f4d65723 100644
--- a/src/MOLECULE/angle_charmm.cpp
+++ b/src/MOLECULE/angle_charmm.cpp
@@ -196,7 +196,7 @@ void AngleCharmm::allocate()
 
 void AngleCharmm::coeff(int narg, char **arg)
 {
-  if (narg != 5) error->all(FLERR, "Incorrect args for angle coefficients");
+  if (narg != 5) error->all(FLERR, "Incorrect args for angle coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo, ihi;
@@ -219,7 +219,7 @@ void AngleCharmm::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients" + utils::errorurl(21));
 }
 
 /* ---------------------------------------------------------------------- */
diff --git a/src/MOLECULE/angle_cosine.cpp b/src/MOLECULE/angle_cosine.cpp
index 86d67f94aa..6a6d838bc0 100644
--- a/src/MOLECULE/angle_cosine.cpp
+++ b/src/MOLECULE/angle_cosine.cpp
@@ -155,7 +155,7 @@ void AngleCosine::allocate()
 
 void AngleCosine::coeff(int narg, char **arg)
 {
-  if (narg != 2) error->all(FLERR, "Incorrect args for angle coefficients");
+  if (narg != 2) error->all(FLERR, "Incorrect args for angle coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo, ihi;
@@ -170,7 +170,7 @@ void AngleCosine::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients" + utils::errorurl(21));
 }
 
 /* ---------------------------------------------------------------------- */
diff --git a/src/MOLECULE/angle_cosine_squared.cpp b/src/MOLECULE/angle_cosine_squared.cpp
index 0ce9d4a064..2074b822eb 100644
--- a/src/MOLECULE/angle_cosine_squared.cpp
+++ b/src/MOLECULE/angle_cosine_squared.cpp
@@ -169,7 +169,7 @@ void AngleCosineSquared::allocate()
 
 void AngleCosineSquared::coeff(int narg, char **arg)
 {
-  if (narg != 3) error->all(FLERR, "Incorrect args for angle coefficients");
+  if (narg != 3) error->all(FLERR, "Incorrect args for angle coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo, ihi;
@@ -188,7 +188,7 @@ void AngleCosineSquared::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients" + utils::errorurl(21));
 }
 
 /* ---------------------------------------------------------------------- */
diff --git a/src/MOLECULE/angle_harmonic.cpp b/src/MOLECULE/angle_harmonic.cpp
index 040cbe7530..e04cecfe0d 100644
--- a/src/MOLECULE/angle_harmonic.cpp
+++ b/src/MOLECULE/angle_harmonic.cpp
@@ -172,7 +172,7 @@ void AngleHarmonic::allocate()
 
 void AngleHarmonic::coeff(int narg, char **arg)
 {
-  if (narg != 3) error->all(FLERR, "Incorrect args for angle coefficients");
+  if (narg != 3) error->all(FLERR, "Incorrect args for angle coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo, ihi;
@@ -191,7 +191,7 @@ void AngleHarmonic::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients" + utils::errorurl(21));
 }
 
 /* ---------------------------------------------------------------------- */
diff --git a/src/YAFF/angle_cross.cpp b/src/YAFF/angle_cross.cpp
index 067fe986e9..0ff3580715 100644
--- a/src/YAFF/angle_cross.cpp
+++ b/src/YAFF/angle_cross.cpp
@@ -220,7 +220,7 @@ void AngleCross::allocate()
 
 void AngleCross::coeff(int narg, char **arg)
 {
-  if (narg != 7) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (narg != 7) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo,ihi;
@@ -247,7 +247,7 @@ void AngleCross::coeff(int narg, char **arg)
       count++;
     }
 
-  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 }
 
 /* ---------------------------------------------------------------------- */
diff --git a/src/YAFF/angle_mm3.cpp b/src/YAFF/angle_mm3.cpp
index 920041f7e9..9cc53e21de 100644
--- a/src/YAFF/angle_mm3.cpp
+++ b/src/YAFF/angle_mm3.cpp
@@ -180,7 +180,7 @@ void AngleMM3::allocate()
 
 void AngleMM3::coeff(int narg, char **arg)
 {
-  if (narg != 3) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (narg != 3) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo,ihi;
@@ -200,7 +200,7 @@ void AngleMM3::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR,"Incorrect args for angle coefficients" + utils::errorurl(21));
 
 }
 
diff --git a/src/angle_zero.cpp b/src/angle_zero.cpp
index 39ff64d2bb..4f41509771 100644
--- a/src/angle_zero.cpp
+++ b/src/angle_zero.cpp
@@ -83,7 +83,7 @@ void AngleZero::allocate()
 void AngleZero::coeff(int narg, char **arg)
 {
   if ((narg < 1) || (coeffflag && narg > 2))
-    error->all(FLERR, "Incorrect args for angle coefficients");
+    error->all(FLERR, "Incorrect args for angle coefficients" + utils::errorurl(21));
 
   if (!allocated) allocate();
 
@@ -102,7 +102,7 @@ void AngleZero::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for angle coefficients" + utils::errorurl(21));
 }
 
 /* ---------------------------------------------------------------------- */