"You exceeded your current quota (...)" - Incorrect error reporting

[janek]

I'm getting '{"message":"You exceeded your current quota, please check your plan and billing details.","type":"insufficient_quota","param":null,"code":null}' on every message. I've double-checked the token and the account and my plan/billing seems fine.

Then as an experiment I put in an incorrect token and still got the same message - so it seems like this is what one gets in case of any error.

My specific problem seems to be #8 (see discussion there)