'm working on a GXT project, and I'm using GXT UiBinder. I'm compiling with ant. The target devmodeworks fine with no errors, and I'm able to see my application running in the browser. But using the targetbuild I get the following error:

[ERROR] Errors in 'jar:file:/home/webbtra/dev/rail_gxt/gxt-2.2.3/gxt.jar!/com/extjs/gxt/ui/client/data/BeanModelLookup.java'[ERROR] Internal compiler errorjava.lang.IncompatibleClassChangeError: Found class com.google.gwt.core.ext.typeinfo.JClassType, but interface was expected