--- a/NoModificationError.st	Tue Sep 20 11:37:33 2016 +0100
+++ b/NoModificationError.st	Mon Oct 03 12:44:41 2016 +0100
@@ -11,7 +11,9 @@
 "
 "{ Package: 'stx:libbasic' }"
 
-ProceedableError subclass:#NoModificationError
+"{ NameSpace: Smalltalk }"
+
+ExecutionError subclass:#NoModificationError
 	instanceVariableNames:''
 	classVariableNames:''
 	poolDictionaries:''
@@ -50,7 +52,8 @@
 !NoModificationError class methodsFor:'documentation'!
 
 version_CVS
-    ^ '$Header: /cvs/stx/stx/libbasic/NoModificationError.st,v 1.2 2009-11-05 22:42:42 cg Exp $'
+    ^ '$Header$'
 ! !
 
+
 NoModificationError initialize!