Netbeans6.0下使用tomcat6.0的问题！

环境为：netbeans6.0（M9）+jdk6.0+tomcat6.0，新建了一个jsf的web项目，只是往里面拖动了几个标签。运行的时候就出现错误错误信息如下：
Exception in thread "main" java.lang.NoClassDefFoundError: javax/faces/webapp/UIComponentELTag
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:299)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
        at org.apache.jasper.compiler.JspDocumentParser.parseCustomAction(JspDocumentParser.java:1167)
        at org.apache.jasper.compiler.JspDocumentParser.startElement(JspDocumentParser.java:402)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.startElement(AbstractSAXParser.java:501)
        at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:400)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2740)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:645)
        at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:508)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
        at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
        at javax.xml.parsers.SAXParser.parse(SAXParser.java:395)
        at org.apache.jasper.compiler.JspDocumentParser.parse(JspDocumentParser.java:179)
        at org.apache.jasper.compiler.ParserController.doParse(ParserController.java:199)
        at org.apache.jasper.compiler.ParserController.parse(ParserController.java:102)
        at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:167)
        at org.apache.jasper.compiler.Compiler.compile(Compiler.java:306)
        at org.apache.jasper.JspC.processFile(JspC.java:994)
        at org.apache.jasper.JspC.execute(JspC.java:1143)
        at org.netbeans.modules.web.project.ant.JspC.main(JspC.java:45)
        at org.netbeans.modules.web.project.ant.JspCSingle.main(JspCSingle.java:100)
F:\NetBeansProjects\WebApplication5\nbproject\build-impl.xml:392: Java returned: 1
        at org.apache.tools.ant.taskdefs.Java.execute(Java.java:107)
        at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
        at sun.reflect.GeneratedMethodAccessor252.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:105)
        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:1329)
        at org.apache.tools.ant.Project.executeTarget(Project.java:1298)
        at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
        at org.apache.tools.ant.Project.executeTargets(Project.java:1181)
        at org.apache.tools.ant.module.bridge.impl.BridgeImpl.run(BridgeImpl.java:256)
        at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:438)
        at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:129)
BUILD FAILED (total time: 4 seconds)