Error of HTTP JSON Parser in data manager

I am using data manager for the training purpose. I am not using any other OCR as the data manager gives me the error of “OCR Settings are preferred”. For Google Vision OCR, the key I have used is from the google cloud platform. and URL is of the same that is shown to me in GCP that is Please also check the attached image for this.
Whenever I import my forms. It gives me the attached error (HTTP JSON Parser error).
I have also put JSON file which is coming from metadata of train extraction scope. It puts it into Not supported files.
Kindly guide me about this error. I have tried pdf jpg files but still, this issue persists.

Google Vision OCR Settings

The OCR URL is NOT the correct one. The OCR URL is something similar or equal to