diff --git a/src/BPM/bond_bpm_rotational.cpp b/src/BPM/bond_bpm_rotational.cpp
index abee373c5d..b8de3faca4 100644
--- a/src/BPM/bond_bpm_rotational.cpp
+++ b/src/BPM/bond_bpm_rotational.cpp
@@ -604,7 +604,7 @@ void BondBPMRotational::allocate()
 
 void BondBPMRotational::coeff(int narg, char **arg)
 {
-  if (narg != 13) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (narg != 13) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo, ihi;
@@ -643,7 +643,7 @@ void BondBPMRotational::coeff(int narg, char **arg)
     if (Fcr[i] / Kr[i] > max_stretch) max_stretch = Fcr[i] / Kr[i];
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/BPM/bond_bpm_spring.cpp b/src/BPM/bond_bpm_spring.cpp
index 0de93fea31..8da72cfb9e 100644
--- a/src/BPM/bond_bpm_spring.cpp
+++ b/src/BPM/bond_bpm_spring.cpp
@@ -399,7 +399,7 @@ void BondBPMSpring::allocate()
 void BondBPMSpring::coeff(int narg, char **arg)
 {
   if ((!volume_flag && narg != 4) || (volume_flag && narg != 5))
-    error->all(FLERR, "Incorrect args for bond coefficients");
+    error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo, ihi;
@@ -424,7 +424,7 @@ void BondBPMSpring::coeff(int narg, char **arg)
     if (1.0 + ecrit[i] > max_stretch) max_stretch = 1.0 + ecrit[i];
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/CG-DNA/bond_oxdna_fene.cpp b/src/CG-DNA/bond_oxdna_fene.cpp
index f5edee9a05..381a131afd 100644
--- a/src/CG-DNA/bond_oxdna_fene.cpp
+++ b/src/CG-DNA/bond_oxdna_fene.cpp
@@ -318,7 +318,7 @@ void BondOxdnaFene::allocate()
 
 void BondOxdnaFene::coeff(int narg, char **arg)
 {
-  if (narg != 2 && narg != 4) error->all(FLERR, "Incorrect args for bond coefficients in oxdna/fene");
+  if (narg != 2 && narg != 4) error->all(FLERR, "Incorrect args for bond coefficients in oxdna/fene" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo, ihi;
@@ -374,7 +374,7 @@ void BondOxdnaFene::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients in oxdna/fene");
+  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients in oxdna/fene" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/CLASS2/bond_class2.cpp b/src/CLASS2/bond_class2.cpp
index da1e8199e0..8a7eec8215 100644
--- a/src/CLASS2/bond_class2.cpp
+++ b/src/CLASS2/bond_class2.cpp
@@ -134,7 +134,7 @@ void BondClass2::allocate()
 
 void BondClass2::coeff(int narg, char **arg)
 {
-  if (narg != 5) error->all(FLERR,"Incorrect args for bond coefficients");
+  if (narg != 5) error->all(FLERR,"Incorrect args for bond coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo,ihi;
@@ -155,7 +155,7 @@ void BondClass2::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR,"Incorrect args for bond coefficients");
+  if (count == 0) error->all(FLERR,"Incorrect args for bond coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/EXTRA-MOLECULE/bond_fene_nm.cpp b/src/EXTRA-MOLECULE/bond_fene_nm.cpp
index 59f60379bd..5aa49265f4 100644
--- a/src/EXTRA-MOLECULE/bond_fene_nm.cpp
+++ b/src/EXTRA-MOLECULE/bond_fene_nm.cpp
@@ -139,7 +139,7 @@ void BondFENENM::allocate()
 
 void BondFENENM::coeff(int narg, char **arg)
 {
-  if (narg != 7) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (narg != 7) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo, ihi;
@@ -164,7 +164,7 @@ void BondFENENM::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/EXTRA-MOLECULE/bond_gaussian.cpp b/src/EXTRA-MOLECULE/bond_gaussian.cpp
index deb37042ad..ceb20c1487 100644
--- a/src/EXTRA-MOLECULE/bond_gaussian.cpp
+++ b/src/EXTRA-MOLECULE/bond_gaussian.cpp
@@ -189,7 +189,7 @@ void BondGaussian::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/EXTRA-MOLECULE/bond_harmonic_restrain.cpp b/src/EXTRA-MOLECULE/bond_harmonic_restrain.cpp
index b4fe73c681..2a9a1e4e7f 100644
--- a/src/EXTRA-MOLECULE/bond_harmonic_restrain.cpp
+++ b/src/EXTRA-MOLECULE/bond_harmonic_restrain.cpp
@@ -133,7 +133,7 @@ void BondHarmonicRestrain::allocate()
 
 void BondHarmonicRestrain::coeff(int narg, char **arg)
 {
-  if (narg != 2) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (narg != 2) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo, ihi;
@@ -148,7 +148,7 @@ void BondHarmonicRestrain::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/EXTRA-MOLECULE/bond_harmonic_shift.cpp b/src/EXTRA-MOLECULE/bond_harmonic_shift.cpp
index 6c87d47f5e..227cf170e4 100644
--- a/src/EXTRA-MOLECULE/bond_harmonic_shift.cpp
+++ b/src/EXTRA-MOLECULE/bond_harmonic_shift.cpp
@@ -128,7 +128,7 @@ void BondHarmonicShift::allocate()
 
 void BondHarmonicShift::coeff(int narg, char **arg)
 {
-  if (narg != 4) error->all(FLERR,"Incorrect args for bond coefficients");
+  if (narg != 4) error->all(FLERR,"Incorrect args for bond coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo,ihi;
@@ -149,7 +149,7 @@ void BondHarmonicShift::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR,"Incorrect args for bond coefficients");
+  if (count == 0) error->all(FLERR,"Incorrect args for bond coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/EXTRA-MOLECULE/bond_harmonic_shift_cut.cpp b/src/EXTRA-MOLECULE/bond_harmonic_shift_cut.cpp
index 7e2212b899..d8daad78d6 100644
--- a/src/EXTRA-MOLECULE/bond_harmonic_shift_cut.cpp
+++ b/src/EXTRA-MOLECULE/bond_harmonic_shift_cut.cpp
@@ -130,7 +130,7 @@ void BondHarmonicShiftCut::allocate()
 
 void BondHarmonicShiftCut::coeff(int narg, char **arg)
 {
-  if (narg != 4) error->all(FLERR,"Incorrect args for bond coefficients");
+  if (narg != 4) error->all(FLERR,"Incorrect args for bond coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo,ihi;
@@ -151,7 +151,7 @@ void BondHarmonicShiftCut::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR,"Incorrect args for bond coefficients");
+  if (count == 0) error->all(FLERR,"Incorrect args for bond coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/EXTRA-MOLECULE/bond_nonlinear.cpp b/src/EXTRA-MOLECULE/bond_nonlinear.cpp
index 32de7276d2..debd100e76 100644
--- a/src/EXTRA-MOLECULE/bond_nonlinear.cpp
+++ b/src/EXTRA-MOLECULE/bond_nonlinear.cpp
@@ -123,7 +123,7 @@ void BondNonlinear::allocate()
 
 void BondNonlinear::coeff(int narg, char **arg)
 {
-  if (narg != 4) error->all(FLERR,"Incorrect args for bond coefficients");
+  if (narg != 4) error->all(FLERR,"Incorrect args for bond coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo,ihi;
@@ -142,7 +142,7 @@ void BondNonlinear::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR,"Incorrect args for bond coefficients");
+  if (count == 0) error->all(FLERR,"Incorrect args for bond coefficients" + utils::errorurl(21));
 }
 
 /* ---------------------------------------------------------------------- */
diff --git a/src/LEPTON/bond_lepton.cpp b/src/LEPTON/bond_lepton.cpp
index 63c66011a1..26bcb6af81 100644
--- a/src/LEPTON/bond_lepton.cpp
+++ b/src/LEPTON/bond_lepton.cpp
@@ -247,7 +247,7 @@ void BondLepton::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/MISC/bond_special.cpp b/src/MISC/bond_special.cpp
index d0c6652672..e8acba561a 100644
--- a/src/MISC/bond_special.cpp
+++ b/src/MISC/bond_special.cpp
@@ -137,7 +137,7 @@ void BondSpecial::allocate()
 
 void BondSpecial::coeff(int narg, char **arg)
 {
-  if (narg != 3) error->all(FLERR,"Incorrect args for bond coefficients");
+  if (narg != 3) error->all(FLERR,"Incorrect args for bond coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo,ihi;
@@ -154,7 +154,7 @@ void BondSpecial::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR,"Incorrect args for bond coefficients");
+  if (count == 0) error->all(FLERR,"Incorrect args for bond coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/MOLECULE/bond_fene.cpp b/src/MOLECULE/bond_fene.cpp
index 7f55c89296..97b08c3f68 100644
--- a/src/MOLECULE/bond_fene.cpp
+++ b/src/MOLECULE/bond_fene.cpp
@@ -149,7 +149,7 @@ void BondFENE::allocate()
 
 void BondFENE::coeff(int narg, char **arg)
 {
-  if (narg != 5) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (narg != 5) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo, ihi;
@@ -170,7 +170,7 @@ void BondFENE::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/MOLECULE/bond_fene_expand.cpp b/src/MOLECULE/bond_fene_expand.cpp
index e115596eb1..fd3a376316 100644
--- a/src/MOLECULE/bond_fene_expand.cpp
+++ b/src/MOLECULE/bond_fene_expand.cpp
@@ -147,7 +147,7 @@ void BondFENEExpand::allocate()
 
 void BondFENEExpand::coeff(int narg, char **arg)
 {
-  if (narg != 6) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (narg != 6) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo, ihi;
@@ -170,7 +170,7 @@ void BondFENEExpand::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/MOLECULE/bond_gromos.cpp b/src/MOLECULE/bond_gromos.cpp
index 1917f18686..fb3872e402 100644
--- a/src/MOLECULE/bond_gromos.cpp
+++ b/src/MOLECULE/bond_gromos.cpp
@@ -120,7 +120,7 @@ void BondGromos::allocate()
 
 void BondGromos::coeff(int narg, char **arg)
 {
-  if (narg != 3) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (narg != 3) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo, ihi;
@@ -137,7 +137,7 @@ void BondGromos::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/MOLECULE/bond_harmonic.cpp b/src/MOLECULE/bond_harmonic.cpp
index a1e926abea..04529ea2eb 100644
--- a/src/MOLECULE/bond_harmonic.cpp
+++ b/src/MOLECULE/bond_harmonic.cpp
@@ -122,7 +122,7 @@ void BondHarmonic::allocate()
 
 void BondHarmonic::coeff(int narg, char **arg)
 {
-  if (narg != 3) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (narg != 3) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo, ihi;
@@ -139,7 +139,7 @@ void BondHarmonic::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/MOLECULE/bond_morse.cpp b/src/MOLECULE/bond_morse.cpp
index b0e19c359c..8b7c474f84 100644
--- a/src/MOLECULE/bond_morse.cpp
+++ b/src/MOLECULE/bond_morse.cpp
@@ -126,7 +126,7 @@ void BondMorse::allocate()
 
 void BondMorse::coeff(int narg, char **arg)
 {
-  if (narg != 4) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (narg != 4) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo, ihi;
@@ -145,7 +145,7 @@ void BondMorse::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/MOLECULE/bond_quartic.cpp b/src/MOLECULE/bond_quartic.cpp
index 4c9670447b..3cb766e0aa 100644
--- a/src/MOLECULE/bond_quartic.cpp
+++ b/src/MOLECULE/bond_quartic.cpp
@@ -197,7 +197,7 @@ void BondQuartic::allocate()
 
 void BondQuartic::coeff(int narg, char **arg)
 {
-  if (narg != 6) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (narg != 6) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo, ihi;
@@ -220,7 +220,7 @@ void BondQuartic::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/RHEO/bond_rheo_shell.cpp b/src/RHEO/bond_rheo_shell.cpp
index 7ef05bbc38..f7b74dbf70 100644
--- a/src/RHEO/bond_rheo_shell.cpp
+++ b/src/RHEO/bond_rheo_shell.cpp
@@ -325,7 +325,7 @@ void BondRHEOShell::allocate()
 
 void BondRHEOShell::coeff(int narg, char **arg)
 {
-  if (narg != 4) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (narg != 4) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo, ihi;
@@ -346,7 +346,7 @@ void BondRHEOShell::coeff(int narg, char **arg)
     if (1.0 + ecrit[i] > max_stretch) max_stretch = 1.0 + ecrit[i];
   }
 
-  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients");
+  if (count == 0) error->all(FLERR, "Incorrect args for bond coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/YAFF/bond_mm3.cpp b/src/YAFF/bond_mm3.cpp
index b3e69881e1..cbb83752f5 100644
--- a/src/YAFF/bond_mm3.cpp
+++ b/src/YAFF/bond_mm3.cpp
@@ -135,7 +135,7 @@ void BondMM3::allocate()
 
 void BondMM3::coeff(int narg, char **arg)
 {
-  if (narg != 3) error->all(FLERR,"Incorrect args for bond coefficients");
+  if (narg != 3) error->all(FLERR,"Incorrect args for bond coefficients" + utils::errorurl(21));
   if (!allocated) allocate();
 
   int ilo,ihi;
@@ -152,7 +152,7 @@ void BondMM3::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR,"Incorrect args for bond coefficients");
+  if (count == 0) error->all(FLERR,"Incorrect args for bond coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------
diff --git a/src/bond_zero.cpp b/src/bond_zero.cpp
index 66cedd4a29..78ef0b9915 100644
--- a/src/bond_zero.cpp
+++ b/src/bond_zero.cpp
@@ -80,7 +80,7 @@ void BondZero::allocate()
 void BondZero::coeff(int narg, char **arg)
 {
   if ((narg < 1) || (coeffflag && narg > 2))
-    error->all(FLERR,"Incorrect args for bond coefficients");
+    error->all(FLERR,"Incorrect args for bond coefficients" + utils::errorurl(21));
 
   if (!allocated) allocate();
 
@@ -98,7 +98,7 @@ void BondZero::coeff(int narg, char **arg)
     count++;
   }
 
-  if (count == 0) error->all(FLERR,"Incorrect args for bond coefficients");
+  if (count == 0) error->all(FLERR,"Incorrect args for bond coefficients" + utils::errorurl(21));
 }
 
 /* ----------------------------------------------------------------------