在netbeans6中启动tomcat5.5时，提示输入用户名和密码，我输入tomcat base下tocmat-user.xml中的用户名和密码，发现不能通过验证，点击取消后，就出现了下面这些错误信息：
部署错误：
尚未授予访问 Tomcat 服务器的权限。请在服务器管理器的 Tomcat 定制器中设置“管理员”角色的正确用户名和口令。
有关详细信息，请参见服务器日志。
at org.netbeans.modules.j2ee.deployment.devmodules.api.Deployment.deploy(Deployment.java:224)
at org.netbeans.modules.j2ee.deployment.devmodules.api.Deployment.deploy(Deployment.java:132)
at org.netbeans.modules.j2ee.ant.Deploy.execute(Deploy.java:103)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
at sun.reflect.GeneratedMethodAccessor89.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:357)
at org.apache.tools.ant.Target.performTasks(Target.java:385)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1189)
at org.apache.tools.ant.module.bridge.impl.BridgeImpl.run(BridgeImpl.java:278)
at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:497)
at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:151)
Caused by: java.lang.IllegalStateException: 尚未授予访问 Tomcat 服务器的权限。请在服务器管理器的 Tomcat 定制器中设置“管理员”角色的正确用户名和口令。
at org.netbeans.modules.tomcat5.TomcatManagerImpl.list(TomcatManagerImpl.java:394)
at org.netbeans.modules.tomcat5.TomcatManager.modules(TomcatManager.java:622)
at org.netbeans.modules.tomcat5.TomcatManager.getAvailableModules(TomcatManager.java:433)
at org.netbeans.modules.j2ee.deployment.impl.TargetServer.getAvailableTMIDsMap(TargetServer.java:393)
at org.netbeans.modules.j2ee.deployment.impl.TargetServer.checkUndeployForSharedReferences(TargetServer.java:349)
at org.netbeans.modules.j2ee.deployment.impl.TargetServer.checkUndeployForSharedReferences(TargetServer.java:298)
at org.netbeans.modules.j2ee.deployment.impl.TargetServer.checkUndeployForSharedReferences(TargetServer.java:295)
at org.netbeans.modules.j2ee.deployment.impl.TargetServer.processLastTargetModules(TargetServer.java:417)
at org.netbeans.modules.j2ee.deployment.impl.TargetServer.init(TargetServer.java:163)