This message appears after I changed from Legacy to Windows compatibility

HI @Larry_Anthony_Jacobo_Zar1

Welcome to UiPath community

It may be the Double Quotation issue "

Try to Re enter the expression again

String.Join(Environment.NewLine,(From r In dt_AgrupacionAConciliar Select r.item("Nº documento")))

Check out this thread

Regards
Gokul

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