Eclipse与tomcat的配置问题

我想用Tomcat做一个文件上传下载的服务器，需要Eclipse与tomcat配置，tomcat已经配置好了，现在联合配置的时候，我运行“运行配置”时，出现下面情况，请大神指点，下面是错误：

警告: Problem with directory [F:\Eclipse\Eclipse\lib], exists: [false], isDirectory: [false], canRead: [false]
 五月 01, 2015 2:34:29 下午 org.apache.catalina.startup.ClassLoaderFactory validateFile
 警告: Problem with directory [F:\Eclipse\Eclipse\lib], exists: [false], isDirectory: [false], canRead: [false]
 五月 01, 2015 2:34:29 下午 org.apache.catalina.startup.ClassLoaderFactory validateFile
 警告: Problem with directory [F:\Eclipse\Eclipse\lib], exists: [false], isDirectory: [false], canRead: [false]
 五月 01, 2015 2:34:29 下午 org.apache.catalina.startup.ClassLoaderFactory validateFile
 警告: Problem with directory [F:\Eclipse\Eclipse\lib], exists: [false], isDirectory: [false], canRead: [false]
 java.lang.ClassNotFoundException: org.apache.catalina.startup.Catalina
     at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
     at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
     at org.apache.catalina.startup.Bootstrap.init(Bootstrap.java:235)
     at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:425)