Join two data table problem

[BlueBird1 (BluebBird)]

i have a problem with joining two dataTables by column names
i verified that both tables contains the same column name and type but still getting error
what can i do in that case

[ppr (Peter)]

Cross reference:

Join DataTables Issue

Hey Community, I want to join two dataTables based on column’s Name, I worked with Join DataTables activity, knowing that my DataTables are not empty, and they have common values, and the column name exists in both of them, Although it still return " Join Data Tables: 0x800AC472 Column name not defined" and I wonder what it could be the problem, or may the column type presents an issue???!!

@BlueBird1

i have a problem with joining two dataTables by column names

which problem in detail? What was done in detail e.g. show screenshot from the join configuration