Cambridge go downloader not working gives StopIteration Error

[Shingroo]

While trying to download from Cambridge go get stuck at 52%

Select a book or a comma-separated list of books: 36
Extracting zip ━━━━━━━━━━━━━━━━━━━━╸━━━━━━━━━━━━━━━━━━━ 52% 0:00:03
Traceback (most recent call last):
File "E:\pdfgrabber-master\main.py", line 280, in
main()
File "E:\pdfgrabber-master\main.py", line 261, in main
downloadbook()
File "E:\pdfgrabber-master\main.py", line 182, in downloadbook
pdfpath = utils.downloadbook(service, token, bookid, books[bookid], progressfun)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "E:\pdfgrabber-master\utils.py", line 53, in downloadbook
pdf = service.downloadbook(token, bookid, data, progress)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "E:\pdfgrabber-master\services\cmb.py", line 171, in downloadbook
tocitem = next(i for i in tocfile.find("xhtml:body", ns).findall("xhtml:nav", ns) if i.get("{http://www.idpf.org/2007/ops}type") == "toc")
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
StopIteration