My workflow reads a CSV and then outputs to a column each time the workflow is completed. After about 3 cycles it paused so I pressed restart in UIpath. Instead the workflow was hanging then did not restart. After manually restarting I got the message
Read CSV: Value cannot be null.
Parameter name: source
When I checked the file it was 0kb with the same name and opening it causes the excel error message “Sorry we couldn’t open the file C://…”
Luckily no important data was lost and I can rebuild the file but seems like a potentially problematic bug