Index: generic/predefined.xotcl
===================================================================
diff -u -rcd12f5a50d870605292d8c957cb2a079f1a17c10 -r782f6b060b16282799fe936bc528f512e562362a
--- generic/predefined.xotcl	(.../predefined.xotcl)	(revision cd12f5a50d870605292d8c957cb2a079f1a17c10)
+++ generic/predefined.xotcl	(.../predefined.xotcl)	(revision 782f6b060b16282799fe936bc528f512e562362a)
@@ -849,7 +849,6 @@
 
   ::xotcl::Slot method type=hasmixin {name value arg} {
     if {![::xotcl::is $value hasmixin $arg]} {
-      error "Value '$value' of $name has not mixin $arg"
       error "expected object with mixin $arg but got \"$value\" for parameter $name"
     }
     return $value