新增出现“未将对象引用设置到对象的实例”

自定义单据新增时出现“未将对象引用设置到对象的实例"
[{"operation":"KD_SSProWorkPlan.MBIClick.BtnAdd"}]
发生时间：10:44:23
错误来源： Kingdee.BOS.Core
错误信息：未将对象引用设置到对象的实例。
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调用堆栈：
在 Kingdee.BOS.Core.DynamicForm.Function.GetFieldValueFunction.Eval()
在 Kingdee.BOS.Core.DynamicForm.Expression.ExpressionEvaluator.EvalCommon(String expression, Dictionary`2 context)
在 Kingdee.BOS.Core.DynamicForm.Expression.ExpressionEvaluator.Evaluate()
在 Kingdee.BOS.Core.DynamicForm.AbstractDefaultValueCalculator.ApplyFieldValue(Field field, DynamicObject rowDataEntity, DefaultValue defValue, Boolean checkNull)
在 Kingdee.BOS.Core.DynamicForm.AbstractDefaultValueCalculator.ApplyFieldDefaultValue(DynamicObject rowDataEntity, Boolean inCopy, Field field)
在 Kingdee.BOS.Core.DynamicForm.AbstractDefaultValueCalculator.ApplyDefaultValue(Entity entity, DynamicObject rowDataEntity, Int32 row, String InOpertion)
在 Kingdee.BOS.Core.DynamicForm.AbstractDynamicFormModel.ApplyDefaultValue(Entity entity, Int32 row, DynamicObject rowDataEntity, String inOperation)
在 Kingdee.BOS.Core.DynamicForm.AbstractDynamicFormModel.InnerCreateNewEntryRow(DynamicObject parentRow, Entity entity, Int32 row, DynamicObject rowDataEntity, Int32 rowCount, Boolean bApplyDefaultValue)
在 Kingdee.BOS.Core.DynamicForm.AbstractDynamicFormModel.CreateNewEntryRow(Entity entity, Int32 row, DynamicObject rowDataEntity)
在 Kingdee.BOS.Core.DynamicForm.AbstractDynamicFormModel.CreateDefEntryRows(Entity entity)
在 Kingdee.BOS.Core.DynamicForm.AbstractDynamicFormModel.CreateNewData(DynamicObject newObject)
在 Kingdee.BOS.Model.Bill.BillModel.CreateNewData(DynamicObject newObject)
在 Kingdee.BOS.Web.Bill.BillView.CreateNewModelData()
在 Kingdee.BOS.Business.Bill.Operation.New.NewAction(Object pkValue)
在 Kingdee.BOS.Business.Bill.Operation.New.Do2Bill()
在 Kingdee.BOS.Business.Bill.Operation.New.ExecuteOperation()
在 Kingdee.BOS.Core.DynamicForm.AbstractDynamicFormOperation.Operation(CallBackWfAfterOperation callbackwf, IOperationResult result)
在 Kingdee.BOS.Core.DynamicForm.AbstractDynamicFormOperation.Execute(InvokeFormOperation4WfParam param, CallBackWfAfterOperation callbackwf)
在 Kingdee.BOS.Web.DynamicForm.AbstractDynamicWebFormView.InvokeFormOperation(String operationNumber)
在 Kingdee.BOS.Business.DynamicForm.BusinessService.ExcuteOperation.DoAction(FormBusinessServiceArgs e)
在 Kingdee.BOS.Core.DynamicForm.FormBusinessServiceUtil.InvokeServices(IDynamicFormView view, Object source, IEnumerable`1 services, Int32 actionType, String activeEntity, DynamicObject activeRow, Int32 rowIndex)
在 Kingdee.BOS.Web.DynamicForm.BusinessServiceCaller.InvokeFormBusiness(IDynamicFormView view, Object source, List`1 formBusinessServices, Int32 actionType, String entityKey, Int32 row)
在 Kingdee.BOS.Web.DynamicForm.DynamicWebFormView.BarItemClick(String parentKey, String barItemKey, BarDataManager bar, Int32 bartype)
在 Kingdee.BOS.Web.DynamicForm.DynamicWebFormView.MainBarItemClick(String barItemKey)
在 Kingdee.BOS.Web.DynamicForm.DynamicWebFormController.MainBarItemClick(String itemKey, JSONArray postDatas)
错误数据： System.Collections.ListDictionaryInternal