--- a/FileOperation.st	Thu Nov 24 22:14:31 2016 +0000
+++ b/FileOperation.st	Sat Nov 26 22:22:17 2016 +0000
@@ -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.