Report: The Hidden expression for the tablix ‘Table_0’ contains an error

Hi experts ,

Got a weird error, I need to add One new field to report(Report is AutoDesign ). So, I created One new field (CostPrice) in InventSumDateTransReport. ,and Referenced it in InventDimPhyDP class as (In ProcessReport) :

inventSumDateTransReport.CostPrice = _inventSum.averageCostPrice();

When I compile It there is no error , but when I add it to the VS Dataset (just add to dataset.)and deploy it. then I run the report (IM >> Reports>> Status >> Phy Invent. >>Phy Intvent By Invent Dim )

Report is AutoDesign

I got this error:

The Hidden expression for the tablix ‘Table_0’ contains an error: Input string was not in a correct format. (rsRuntimeErrorInExpression)

Any hint is greatly appreciated

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