weblogic启动报错,求高手

weblogic启动就报
loymentException: java.lang.ClassNotFoundException: org.mortbay.jetty.Server
weblogic.management.DeploymentException: java.lang.ClassNotFoundException: org.mortbay.jetty.Server
at weblogic.application.internal.BaseDeployment.throwAppException(BaseDeployment.java:131)
at weblogic.application.internal.BaseDeployment.prepare(BaseDeployment.java:245)
at weblogic.application.internal.SingleModuleDeployment.prepare(SingleModuleDeployment.java:53)
at weblogic.application.internal.DeploymentStateChecker.prepare(DeploymentStateChecker.java:158)
at weblogic.deploy.internal.targetserver.AppContainerInvoker.prepare(AppContainerInvoker.java:61)
Truncated. see log file for complete stacktrace
Caused By: java.lang.ClassNotFoundException: org.mortbay.jetty.Server
at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:981)
at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:942)
at weblogic.utils.classloaders.ChangeAwareClassLoader.findClass(ChangeAwareClassLoader.java:83)
at weblogic.utils.classloaders.GenericClassLoader.doFindClass(GenericClassLoader.java:564)
at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:500)
Truncated. see log file for complete stacktrace

http://blog.csdn.net/zhuying_linux/article/details/7715305