HttpError 500 when requesting <Doc> Details: "Internal error encountered.

Seem to get a 500 code (ommitting some of the characters with *)

bibtex2docs.py 1VL_nUXZ3KMDcLRpFlGaBFKqT60-************ bib.bib credentials.json

<HttpError 500 when requesting https://docs.googleapis.com/v1/documents/1VL_nUXZ3KMDcLRpFlGaBFKqT60-************?alt=json returned "Internal error encountered.". Details: "Internal error encountered.">