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What is does that error message say?
I don't know your language.
Is it French?
I see you do a read Range in your screen Initialize event, but you are missing the event to catch the range data when it arrives:
I recommend looking through the spreadsheet blocks that read and write to the sheet, and see if you can match them up with the events that catch the results.
Do not be discouraged, you are going through the same learning curve you would get in any implementation.