NOT_FOUND: Model 'gemini-1.5-flash' not found

Well I have figured out a lot and I dug into the Genkit and found my flow has this error which is NOT_FOUND: Model ‘gemini-1.5-flash’ not found

I’m guessing this is the default Firebase model selection for text but somehow I have broken it.
Any points of clues would be helpful and greatly apparated.
Thanks in advance.