The content of element type "web-app" must match "(icon?,display-name?,description?,distributable?,c

web.xml <web-app> 出现以下错误：

The content of element type "web-app" must match "(icon?,display-name?,description?,distributable?,context-param*,filter*,filter-mapping*,listener*,servlet*,servlet-mapping*,session-config?,mime-mapping*,welcome-file-list?,error-page*,taglib*,resource-env-ref*,resource-ref*,security-constraint*,login-config?,security-role*,env-entry*,ejb-ref*,ejb-local-ref*)".

解决方法：

1.严格按照提示的顺序书写

2：删除<!DOCTYPE 。。。。这段内容 规范