急急急，求大神解决，，，

系统里有单据转换规则，我将字段映射的字段类型修改了，没有先改转换规则，结果现在都打不开单据和转换规则。。。急急急，求大神解答错误类型： System.NullReferenceException, mscorlib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
错误信息： Object reference not set to an instance of an object.
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调用堆栈：

Server stack trace:
at Kingdee.BOS.App.Core.MetaServicePlugIn.FormMetaServicePlugIn.CreateFieldRefPropertieyKeys(FormMetadata formMetaData, List`1 fieldsByFormId, FormMetadata refFormMetaData)
at Kingdee.BOS.App.Core.MetaServicePlugIn.FormMetaServicePlugIn.CreateFieldRefProperties(FormMetadata formMetaData)
at Kingdee.BOS.App.Core.MetaServicePlugIn.FormMetaServicePlugIn.OnLoadEmbedRefObject(AfterReadArgs e)
at Kingdee.BOS.App.Core.MetadataXmlReader.LoadEmbedRefObject(String id, String layoutViewId, Boolean runtime, Boolean getBaseObject, Int32 modeltypeId, Boolean isLoadSubObject, AbstractBusinessMetadata meta, MetaDataLoadService loadService)
at Kingdee.BOS.App.Core.MetadataXmlReader.Load(String id, Boolean runtime, Boolean loadEmbedRefObject, Boolean getBaseObject, Int32 modeltypeId, Boolean isLoadSubObject)
at Kingdee.BOS.App.Core.MetaDataService.Load(Context ctx, String id, String layoutViewId, Boolean bRuntime)

Exception rethrown at [0]:
at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
at Kingdee.BOS.Contracts.IMetaDataService.Load(Context ctx, String id, String layoutViewId, Boolean bRuntime)
at Kingdee.BOS.ServiceHelper.MetaDataServiceHelper.Load(Context ctx, String id, String layoutViewId, Boolean bRuntime)
at Kingdee.BOS.ServiceFacade.ServicesStub.Metadata.MetadataService.Load(String id, Boolean bRuntime)