gwt and ibm rsa

I have the gwt hello app running in rsa 8.0.4 and tomcat

I cannot install the eclipse plugin or go through the eclipse update site because of security restrictions where i work.

I have modified the Hello.java class and would like to re-build the app and republish. When i try and run the ant target gwtc i get this error

java]    [WARN] Unable to read: jar:file:/C:/workspaces/gwt_04092013/Hello/WebContent/WEB-INF/lib/gwt-user.jar!/com/google/gwt/user/User.gwtar. Skipping: java.io.InvalidClassException: com.google.gwt.dev.jjs.SourceOrigin$1; local class incompatible: stream classdesc serialVersionUID = -2407201776821563037, local class serialVersionUID = 4713379764594032837

     [java]    [WARN] Unable to read: jar:file:/C:/workspaces/gwt_04092013/Hello/WebContent/WEB-INF/lib/gwt-user.jar!/com/google/gwt/core/Core.gwtar. Skipping: java.io.InvalidClassException: com.google.gwt.dev.jjs.SourceOrigin$1; local class incompatible: stream classdesc serialVersionUID = -2407201776821563037, local class serialVersionUID = 4713379764594032837


anyone have an idea what it might be?

--
You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group.
To unsubscribe from this group and stop receiving emails from it, send an email to google-web-toolkit+unsubscribe@googlegroups.com.
To post to this group, send email to google-web-toolkit@googlegroups.com.
Visit this group at http://groups.google.com/group/google-web-toolkit.
For more options, visit https://groups.google.com/groups/opt_out.