myeclipse里配置tomcat始终报错。

我先安装的myeclipse 8，现在想学web，就安装了JDK 7和tomcat 6，都分别设置了环境变量，要在myeclipse里把JDK导入了，但是myeclipse里配置tomcat时，窗口——>首选项——>sever——>就在这时，只要一点击sever里面的tomcat，jetty，等，sever里面的都出错，什么75错误。好烦啊！！！错误日志：报错如下：
eclipse.buildId=unknown
java.version=1.6.0_13
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=zh_CN
Command-line arguments: -os win32 -ws win32 -arch x86
Error
Thu Aug 25 21:41:12 CST 2011
Problems occurred when invoking code from plug-in: "org.eclipse.jface".java.lang.ArrayIndexOutOfBoundsException: 75
at com.genuitec.eclipse.core.C.Ą(Unknown Source)
at com.genuitec.eclipse.core.A.Ă(Unknown Source)
at com.genuitec.eclipse.core.A.ă(Unknown Source)
at com.genuitec.eclipse.core.A.ă(Unknown Source)
at com.genuitec.eclipse.core.A.ā(Unknown Source)
at com.genuitec.eclipse.core.C.ā(Unknown Source)
at com.genuitec.eclipse.core.ViperCore.Ă(Unknown Source)
at com.genuitec.eclipse.core.ViperCore.isLicenseValid(Unknown Source)
at com.genuitec.eclipse.core.vU.Ą(Unknown Source)
at com.genuitec.eclipse.core.vU.B__111164asdlkfjw2asl_23(Unknown Source)