Books - Error in DXCustomFunctionsHelper

Hi,

I have a book, with different report, but 2 of them are excel spreadsheets with cubeviews inside. They work, but after created and attached i am getting this error if i want to open it again and do any change.

 

Error in DXCustomFunctionsHelper.GetSpreadsheetDataProvider(). The spreadsheetDataProvider is not available using the Workbook's Tag property.

It works in the book....

Any idea? Anyone?

 

Thanks

JJ