starting tomcat v7.0 server at localhost has encountered a problem.....错误解法方法

在eclipse中写jsp页面时，修改了xml文件，启动Tomcat7.0出现了下图情况： 并且在控制台上显示警告：SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:day04' did not find a matching

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