UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte

hi, i'm getting this error while trying to do the ner.teach recipe, i've cleaned my data but it's still giving me this error, can you help point out what's wrong?

Thanks in advance!

Maybe your file encoding is off? If you google something like "change file encoding utf8" plus your operating system, you should find instructions to check whether your file is UTF-8 and how to change the encoding if it's not.