java - Invalid deployment descriptor web.xml -

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whenever create new servlet on netbeans 8.0.2 shows, invalid deployment descriptor web.xml

and there cross sign on web.xml too.

web.xml 

<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"    xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"    xsi:schemalocation="http://xmlns.jcp.org/xml/ns/javaee      http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"  version="3.1"> <session-config>     <session-timeout>         30     </session-timeout> </session-config>


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