weblogic里面部署一个JSF应用,出现错误weblogic.management.DeploymentException

在weblogic里面部署一个JSF应用，
它总是出现错误weblogic.management.DeploymentException: Attempt to operate 'start' on null BasicDeploymentMBean : login，请问有没有人知道原因啊，急啊，谢谢大家了！
具体如下：
weblogic.management.DeploymentException: Attempt to operate 'start' on null BasicDeploymentMBean : login
at weblogic.deploy.internal.targetserver.DeploymentManager.assertDeploymentMBeanIsNonNull(DeploymentManager.java:1291)
at weblogic.deploy.internal.targetserver.DeploymentManager.findDeploymentMBean(DeploymentManager.java:1335)
at weblogic.deploy.internal.targetserver.DeploymentManager.createOperation(DeploymentManager.java:1000)
at weblogic.deploy.internal.targetserver.DeploymentManager.createOperations(DeploymentManager.java:1381)
at weblogic.deploy.internal.targetserver.DeploymentManager.handleUpdateDeploymentContext(DeploymentManager.java:159)