登录vCenter提示出错：Object reference not set to an instance of an object

今天在使用vSphere Client登录vCenter时莫名其妙的提示错误：
Object reference not set to an instance of an object
在viclient.log文件中有如下信息：
[Update M:SrvMsg :56] 2012-11-10 16:13:00.317 RMI Result Integrity.ComplianceStatusManager.GetComplianceStatus - 635
BaselineComplianceStatusCollector:session[5F5B677A-2C77-4B94-A3EE-F256A4F22DC8]0B973DA9-B2BC-4327-8616-0A65C1FEFECB [wdcsmvc.vmware.com:8084]
[ :Error :M: 6] 2012-11-10 16:13:00.333 System.NullReferenceException: Object reference not set to an instance of an object.
at VimIntegrityClient.Common.Utils.ManagedObjectUtils.ToManagedObjectReference(ManagedObject managedEntity)
at VimIntegrityClient.UpdateManagerPlugin.ViewExtension_Activated(Extension sender)
at VpxClient.Plugins.ExtensionImpl.Activate()
[ :Error :M: 6] 2012-11-10 16:13:00.333 System.NullReferenceException: Object reference not set to an instance of an object.
at VimIntegrityClient.Common.Utils.ManagedObjectUtils.ToManagedObjectReference(ManagedObject managedEntity)
at VimIntegrityClient.UpdateManagerPlugin.ViewExtension_Activated(Extension sender)
at VpxClient.Plugins.ExtensionImpl.Activate()
分析：
从viclient.log日志文件中显示了相关错误信息，这是一个.NET导致的故障，而在从错误信息中的“Ojbect reference not set to an instance of an object”来看也表示是.NET导致的故障。
解决方法如下：
vSphere Client登录到vCenter Server 4.1之后在插件管理器里禁止掉Update Manager插件即可。
如果安装了VMware Data Recovery版本过高后，克隆的时候也会导致该问题，请禁用VMware Data Recovery插件，重启VC服务器。