Spring MVC Web. XML configuration appears Attribute "Xmlns:xsi" must is declared for element type "Web-app"

<span style= "FONT-SIZE:18PX;" >multiple annotations found at the This line:
	-Attribute "xmlns:xsi" must is declared for element type "Web-app".
	-Attribute "xsi:schemalocation" must is declared for element type "Web-app".
	-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*) ".
	-Attribute "version" must is declared for element type "Web-app".
	-Attribute "xmlns" must is declared for element type "Web-app" .</span>

This error is required WebApp This tag must be the first line, there are no comments in front of the document can be, so webapp this label before the document is all deleted.