Could you show us the exception you're getting in development mode?
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The UiBinder problem should be resolved if you use the latest 2.2.1-SNAPSHOTs. Last week Errai 2 has been upgraded to use GWT 2.5 and the UiBinder compatibilty has been fixed. So, there hopefully should be no reason for you to mix Errai 3.0-SNAPSHOTs and Errai 2.2.1-SNAPSHOTs.