Hi vazdan
My guess is docs here is malformed - it is not correctly encoded and cannot be decoded
https://github.com/frappe/frappe/blob/develop/frappe/desk/form/run_method.py#L21
A similar error occurs here too, in my case a broken bench environment
Bench commands all abort with this ValueError: No JSON object could be decoded
I can’t say what the root cause of this error is and am looking into this!