The selection did not contain any resources that can run on a server解决思路

The selection did not contain any resources that can run on a server
我导入一个Jsp网站程序到Eclipse中后运行Tomcat，给出The selection did not contain any resources that can run on a server。请问怎么回事啊

[解决办法]
没有找到web.xml?eclipse不懂的
[解决办法]
那怎么解决啊？