应收单选单时报错

{"operation":"BOS_ConvertOpForm.LoadData"}]
发生时间：08:56:26
错误来源： mscorlib
错误信息：未能找到LinkEntityPolicy对应的数据类型，请检查是否Xml中拼写错误。
时机：反序列化
位置：行(1),列(236)
级别：错误
===================================================
调用堆栈：
Server stack trace:
at Kingdee.BOS.Serialization.DcxmlBinder.ThrowException(SerializationException serializationException)
at Kingdee.BOS.Serialization.DcxmlSerializerReadImplement.BindToType(IDataEntityType canUseType)
at Kingdee.BOS.Serialization.DcxmlSerializerReadImplement.ReadElement(IDataEntityType dt, Object entity)
at Kingdee.BOS.Serialization.DcxmlSerializerReadImplement.DoCollectionPropertyAction(String action, ICollectionProperty property, Object entity)
at Kingdee.BOS.Serialization.DcxmlSerializerReadImplement.ReadCollectionProperty(ICollectionProperty property, Object entity)
at Kingdee.BOS.Serialization.DcxmlSerializerReadImplement.ReadElement(IDataEntityType dt, Object entity)
at Kingdee.BOS.Serialization.DcxmlSerializerReadImp

请问什么原因造成的？