Problem face in Validation Command (Pop-up Error Box)

N

Nono

Hi, I am facing a problem with the Validation problem. I am two excel file
names "A" n "B". Currently I am using Validation command in file "A" to list
the items in file "B".

Once the procedures are done and I pressed the "Down arrow" button in file
"A". A Error box popped up on the screen.

How can I rectify the problem?

Thank you
 
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