早上启动eclipse某项目报错提示：cvc-elt.1: Cannot find the declaration of element ‘web-app’；
昨个儿还正常，今儿就不行了？
难道是直接强关电脑造成的？
but，i have the answer!!!
This worked for me:
the relevant option is at Window->Preferences->General->Network Connections->Cache->Disable Caching. Check that box, then clean and build.
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