Trouble with repeating group

Hi everyone,

I am realizing a survey using using a repeating group containing cascading questions and another repeating group (that appears if a skip logic condition is respected).
I’m using KoBoCollect to fill in my forms, and whenever I try to repeat the first group, the following error message appears:

I unfortunately have no idea where to begin to solve this problem, as I don’t know where/how to use the indexed-repeat() function. Would any of you have any tips and/or solutions ?

I have inluded the XLSForm in this message, should it be any help.

Thank you,

v6_Audit.xls (13.5 KB)