I'm on a mac but I don't think I've seen a error like that. I upgraded my 2.1.0 project to 2.1.1 and didn't have a issue. Post up your pom.xml and maybe I can spot something.
Also... http://olamy.blogspot.com/2010/12/using-gwt-sdk-211-with-gwt-maven-plugin.html -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to google-web-tool...@googlegroups.com. To unsubscribe from this group, send email to google-web-toolkit+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.