When trying to test an upload for new courses I am getting an Invalid UTF-8 error from one of my files. Is there any way to identify the data that is causing the error? The file generates courses for our current academic year and uploads fine, but the test for next years courses is causing an error. It seems most likely there is an error somewhere in my data, but I don't know how to find it in the 1200ish courses I have to import.