Index: generic/nsf.c
===================================================================
diff -u -rce6d76dc0353274665973facb2546678bc7ebd92 -r3ffcbc1b5cf21f850b3dd486f9aa48c93f08e7a8
--- generic/nsf.c	(.../nsf.c)	(revision ce6d76dc0353274665973facb2546678bc7ebd92)
+++ generic/nsf.c	(.../nsf.c)	(revision 3ffcbc1b5cf21f850b3dd486f9aa48c93f08e7a8)
@@ -21007,7 +21007,8 @@
 
     if (unlikely(currentParamPtr > lastParamPtr)) {
       return NsfUnexpectedArgumentError(interp, ObjStr(argumentObj),
-					(Nsf_Object*)object, paramPtr, procNameObj);
+					(Nsf_Object*)object, paramPtr, 
+                                        NsfMethodNamePath(interp, NULL /* use topmost frame */, NsfMethodName(procNameObj)));
     }
 
     if (*currentParamPtr->name == '-') {
@@ -21117,7 +21118,7 @@
 		return NsfUnexpectedNonposArgumentError(interp, argumentString,
 							(Nsf_Object *)object,
 							currentParamPtr, paramPtr,
-							procNameObj);
+                                                        NsfMethodNamePath(interp, NULL /* use topmost frame */, NsfMethodName(procNameObj)));
 	      }
 	      pPtr = currentParamPtr = nextParamPtr;
 	    }
@@ -21172,7 +21173,7 @@
 		return NsfUnexpectedNonposArgumentError(interp, argumentString,
 							(Nsf_Object *)object,
 							currentParamPtr, paramPtr,
-							procNameObj);
+                                                        NsfMethodNamePath(interp, NULL /* use topmost frame */, NsfMethodName(procNameObj)));
 	      }
 	      pPtr = currentParamPtr = nextParamPtr;
 	    }
@@ -21191,7 +21192,8 @@
      */
     if (unlikely(pPtr > lastParamPtr)) {
       return NsfUnexpectedArgumentError(interp, ObjStr(argumentObj),
-					(Nsf_Object *)object, paramPtr, procNameObj);
+					(Nsf_Object *)object, paramPtr, 
+                                        NsfMethodNamePath(interp, NULL /* use topmost frame */, NsfMethodName(procNameObj)));
     }