Repeat group with Google sheets - how to do it?

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I have the same problem.
Only the first sheet in the calc document is created. In the first sheet, I can see a formula like yours showing "error". You can see only one sheet in my google document.

Capture%20d%E2%80%99%C3%A9cran%20de%202019-02-09%2012-48-10
Capture%20d%E2%80%99%C3%A9cran%20de%202019-02-09%2012-48-101032×550 51.2 KB

Note that I have another form, with a single "repeat 3 times", it works perfectly in the other one.