Group by on datatable

I try to groupby columns and get sum on 1 excel. Now I read the excel to datatable and use BalaReva.DataTable.Activities.Group By Aggregation. and got runtime error:

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Any idea on other ways to do this?Thanks!

Hey @cllrebecca

Check this existing thread : - DataTable Select function cannot perform “=” operation on System.Double and System.String - #12 by aksh1yadav

Regards…!!
Aksh