Index: generic/nsf.c
===================================================================
diff -u -r7b09de6f9ec1cc5caf39751fa4f23c62365e8dfe -rad4acf8e7b3c2279b4711aa9cfd5aed6d86e2b98
--- generic/nsf.c	(.../nsf.c)	(revision 7b09de6f9ec1cc5caf39751fa4f23c62365e8dfe)
+++ generic/nsf.c	(.../nsf.c)	(revision ad4acf8e7b3c2279b4711aa9cfd5aed6d86e2b98)
@@ -10089,7 +10089,9 @@
   *outObjPtr = objPtr;
   /*fprintf(stderr, "convert to parameter '%s' t '%s'\n", value, pPtr->type);*/
   if (*value == ':' ||  (*value == '-' && *(value + 1) == ':')) {
-    return NsfObjErrType(interp, NULL, objPtr, pPtr->type, (Nsf_Param *)pPtr);
+    return NsfPrintError(interp, "leading colon in '%s' not allowed as in parameter specification '%s'",
+			 ObjStr(objPtr), pPtr->name);
+    //NsfObjErrType(interp, NULL, objPtr, pPtr->type, (Nsf_Param *)pPtr);
   }
 
   *clientData = (char *)ObjStr(objPtr);