'Unable to reach OpenAI' error when using gemini 1.5 flash

I’ve added and verified google gemini api key and removed open ai key, which i understood was optional, and now an getting this error when chatting with gemini-1.5-flash:

We encountered an issue when using your OpenAI API key. Please check your API key settings and try again. API Error: {“error”:{“message”:"Incorrect API key provided:

request id 02e63e32-73b5-4646-8f4b-d35aa10eb499

Hey, make sure you’ve disabled your OpenAI key, not just deleted your API key.

Yes I’ve done that thank you