Eclipse XML error cvc-complex-type.2.4.c:the matching wildcard is strict, but no declaration can be Fou

Eclipse XML error cvc-complex-type.2.4.c:the matching wildcard is strict, but no declaration can being found for element

I believe many people will encounter this trouble, import the project, the project itself without any problems, but the XML error is red. Click on the XML file to find a lot of errors, there are about the interceptor, there is about the action, anyway is the XML a lot of the element has a problem with error. Search at night, some people in the xsi:schemalocation inside add an address, in fact, only for a small number of errors, may be jar bag did not fix. There are many mistakes in the case, especially the project is no problem, before it can be run to the other direction to consider.
This time to explain the XML error does not affect, we click on the project (propretise)-and then choose Validation, will the right tick to go, these errors have no effect, click to run the project on it.