Aistudio: Unable to use gemini 2.5 flash image model on "build" feature

I am a gemini pro user who uses the build feature of aistudio to build my apps, yet I am unable to use gemini 2.5 flash image model on the apps that I build on aistudio. Please look into this. I include in my prompt “Use gemini flash 2.5 image model to include relevant images on the app” but it never works on aistudio (It works on Gemini app tho).

I get this error message despite being on a pro plan. Please fix this.

@Alisa_Fortin @Logan_Kilpatrick

Hi @Zuy-hxf-cffg

Based on the image, looks like the request was to Gemini 3.5 Flash

can you share what was the prompt used ?

@Mustan_lokhand The prompt was: Make an official website of Mughal Empire. Use gemini 2.5 flash image to generate images for that website. Before the website opens, there should be a button called “generate images” on the loading screen. Use these generated images on relevant places of this website.

thank you,
taking a look into this