UITable in App Designer - Inserting text into specific cell

Hello,
I have a problem that I can't insert char into a specific cell of UITable in App Designer (using indexing). I'm trying to do it like this:
app.UITable.Data(1,1) = 'test';
but I always get the error " Unable to perform assignment because the indices on the left side are not compatible with the size of the right side. ". I even tried using various different data types for this, but without luck.
Do you know where the problem might be?

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R2021a

Asked:

on 26 Jun 2021

Commented:

on 1 Jul 2021

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