Your Sencha GXT library is most likely not compatible to GWT 2.6. I guess you need to update GXT if possible or go back to GWT 2.4 or 2.5.1 (whatever works).
-- J. -- 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+unsubscr...@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.