TypeError: write() argument must be str, not bytes

[VDK]

I'm trying out this app and quickly get this TypeError:

Traceback (most recent call last): File "C:\Users\Vera\Downloads\keyword\keywords_tfidf.py", line 90, in <module> corpus, dictionary = cp.MyCorpus(doc_folder, stop_folder, str(doc_length)).load() File "C:\Users\Vera\Downloads\keyword\corpus.py", line 99, in __init__ self.doc_list = get_documents(doc_dir, doc_length) File "C:\Users\Vera\Downloads\keyword\corpus.py", line 31, in get_documents print('Processing documents ...') File "C:\Users\Vera\AppData\Local\Programs\Python\Python310\lib\codecs.py", line 378, in write self.stream.write(data) TypeError: write() argument must be str, not bytes

I put a collection of txt-files in the "documents" folder but I don't have stopwords. How do stopwords need to be formatted?
I'm using python 3.10.0 on a Windows PC.