From 01698ddc2ee952328c4e6318c62cd95038abe820 Mon Sep 17 00:00:00 2001
From: Axel Kohlmeyer <akohlmey@gmail.com>
Date: Mon, 10 Mar 2025 17:06:37 -0400
Subject: [PATCH] improve error messages for easier debugging

---
 src/SPIN/fix_nve_spin.cpp | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/SPIN/fix_nve_spin.cpp b/src/SPIN/fix_nve_spin.cpp
index 1a08e2cf00..89a77b31ce 100644
--- a/src/SPIN/fix_nve_spin.cpp
+++ b/src/SPIN/fix_nve_spin.cpp
@@ -584,7 +584,8 @@ void FixNVESpin::sectoring()
   }
 
   if (rv == 0.0)
-   error->all(FLERR,"Illegal sectoring operation");
+   error->all(FLERR, Error::NOLASTLINE,
+              "No suitable cutoff found for sectoring operation: rv = {}", rv);
 
   double rax = rsx/rv;
   double ray = rsy/rv;
@@ -600,7 +601,8 @@ void FixNVESpin::sectoring()
   nsectors = sec[0]*sec[1]*sec[2];
 
   if (sector_flag && (nsectors != 8))
-    error->all(FLERR,"Illegal sectoring operation");
+    error->all(FLERR, Error::NOLASTLINE,
+               "Illegal sectoring operation resulting in {} sectors instead of 8", nsectors);
 
   rsec[0] = rsx;
   rsec[1] = rsy;