Check your dependencies, this was fixed in GWT 2.4: https://github.com/gwtproject/
gwt/commit/(see linked issue, exact same error message) ad144ac26693272b2d897454a13b7f ddf389fedf
Yes, I also found this issue. But I don't know how to solve it.
Do you mean the dependencies in the pom.xml file? Which dependencies are important?
And why is the same UIBinder xml file ok in the non-maven project?
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