哪位高手帮忙看看这是什么错误啊！

Java+Tomcat6.0的Servlet HTTP Status 500 - type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception javax.servlet.ServletException: Error allocating a servlet instance        org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)        org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)        org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:856)        org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:565)        org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1509)        java.lang.Thread.run(Thread.java:595)
root cause java.lang.SecurityException: Servlet of class org.apache.catalina.servlets.InvokerServlet is privileged and cannot be loaded by this web application        org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)        org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)        org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:856)        org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:565)        org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1509)        java.lang.Thread.run(Thread.java:595)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.16 logs.
Apache Tomcat/6.0.16

lz 你新来的啊，走错门啦