boss单据打开报错

boss单据打开时报错，报错界面
发生时间： 2016-01-21 16:20:23
错误来源：
错误类型： Kingdee.BOS.ServiceFacade.ServiceException, Kingdee.BOS.ServiceFacade.Common, Version=5.1.268.4, Culture=neutral, PublicKeyToken=null
错误信息： The value "Kingdee.BOS.Core.Metadata.FormElement.FormOperation" is not of type "Kingdee.BOS.Core.Metadata.FormElement.FormBusinessService" and cannot be used in this generic collection.
Parameter name: value
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调用堆栈：
在 Kingdee.BOS.ServiceFacade.KDServiceClient.KDServiceClient.ParseException(String message, Encoding encoding, MessageFormats format)
在 Kingdee.BOS.ServiceFacade.KDServiceClient.KDServiceClient.GetResponseContent(HttpWebResponse rsp, KDBaseRequest kdrequest)
在 Kingdee.BOS.ServiceFacade.KDServiceClient.KDServiceClient.DoPost(KDBaseRequest kdrequest)

请问什么原因，该如何修改