Getting 'Export Failed' while downloading data in xls format

When I tested download the data in XLS (even though we are not finished assessment yet), export failed was noted (showing begin_repeat_fcyttBCX5 and begin_repeat_od0masZiH), why this happen and what to do to be able to download in XLS format?

I noticed multiple issues (different queries) in your post. So to document them smoothly i split this issue to a different post so that it can be indexed properly and users with similar query could reference for the same.

Regarding your query, would you mind having a look at the post discussed previously (it should help you understand and solve your issue):