Upload Data Parse Error

Hi I keep receiving the following error when making a bulk upload. It seems to be inconsistently occuring if I remove all but 2 rows from my csv (I’ve also tried TSV).

I did this successfully with a large file several months ago and re-attempted with the same file and am now getting this error.

Has anybody seen this? Also, the uploader has [Beta] and am unsure if there are changes made to the uploader