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com.google.gwt.core.ext.UnableToCompleteException: (seeprevious log entries) at com.google.gwt.dev.cfg.ModuleDefSchema$PropertyAttrCvt.convertToArg(ModuleDefSchema.java:875)[INFO] at com.google.gwt.dev.util.xml.HandlerArgs.convertToArg(HandlerArgs.java:64)[INFO] at com.google.gwt.dev.util.xml.HandlerMethod.invokeBegin(HandlerMethod.java:214)