Bug with import to module

I have module, when I try to make import, here is error that I get:
“Missing required fields: Name”
You can see attachment

Even if I manualy create 1 unit, after make export of that unit to *.csv file. And after make import of the same file, without editing it - I receive the same error “Missing required fields: Name”

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Problem appeared because there was something wrong in *.csv file in column number 3.
So I copy/past data from column #3 to column #6. And set in import wizard to use data from #6 instead of #3. After everything works fine.

I still have no idea why that happened.