--- a/FileOperation.st	Fri Nov 25 13:43:24 2016 +0100
+++ b/FileOperation.st	Fri Nov 25 14:54:19 2016 +0100
@@ -1602,7 +1602,7 @@
                 stringWithCRs:'Cannot rename file %1 to %2 !!\\(%3)'
                 with:oldFile baseName
                 with:newName
-                with:(OperatingSystem lastErrorString).
+                with:ex errorString.
         Dialog warn:msg.
         result := false.
         ^ self.