在将GWT升级到v2.4时出现错误

I am trying to upgrade GWT to v2.4. I am facing problems. When Run As -> Ant Built (after upgrade the project), the .xml files are missing (not generated in the project) and the project build successfully, but there is strange behavior which shows errors in the console. I will post the errors that are appearing (some of them).I am trying to upgrade GWT to v2.4. I am facing