Bulk Extension Module not working

I am having trouble with the bulk extension module. I was able to import extensions once via a csv file, but now as I want to edit or delete, I am always getting below error.
I am however using the correct action terms.
What could be wrong?

Row 1: Headers parsed.
Row 2: Unrecognized action: the only actions recognized are add, edit, del.
Row 3: Unrecognized action: the only actions recognized are add, edit, del.

The spreadsheet tells us nothing. It would be more helpful to see the CSV.