ValueError: substring not found

[EnzoBustos]

Hello, I need to use this Question Generation, for one of my projects, but I´m having trouble with the input text. Always seems to get this error "ValueError: substring not found", and I remove commas and special characters in my text, but I don´t have a clue why this keeps happening.

[moelllerniklas]

This propably happens because your transformers version does not meet the requirement of transformers==3.0.0, alternatively check out my fork https://github.com/niklaspm/question_generation which includes pull requests #87 and #34 (fixed substring error and therefore support for current transfomers==4.18.0 version; and added installation via setup.py)