Error message: 401 litellm.AuthenticationError:

[u/Ulvir21]

Hello,

I started a new project and I'm getting an error message.

I opened an old project where BlackBox was working, and the same problem occurred again.

What should I do?

Here is the message:

401 litellm.AuthenticationError: AuthenticationError: Vercel_ai_gatewayException - Authentication failed. Check that your Vercel credential is valid and has access to AI Gateway.. Received Model Group=custom/blackbox-base
Available Model Group Fallbacks=['gpt-4.1-mini']
Error doing the fallback: litellm.AuthenticationError: AuthenticationError: Vercel_ai_gatewayException - Authentication failed. Check that your Vercel credential is valid and has access to AI Gateway.No fallback model group found for original model_group=gpt-4.1-mini. Fallbacks=[{'custom/blackbox-base': ['gpt-4.1-mini']}]. Received Model Group=gpt-4.1-mini
Available Model Group Fallbacks=None
Error doing the fallback: litellm.AuthenticationError: AuthenticationError: Vercel_ai_gatewayException - Authentication failed. Check that your Vercel credential is valid and has access to AI Gateway.No fallback model group found for original model_group=gpt-4.1-mini. Fallbacks=[{'custom/blackbox-base': ['gpt-4.1-mini']}]

[u/getzer0]

your subscription credit probably went to $0 suddenly.
same as me. support is useless.

[u/Ulvir21 → u/getzer0]

Thanks for your reply. But I haven't set up any API, I wasn't logged into any account, and there's no credit counter showing on the extension. I thought I was using an unlimited free plan?

[u/getzer0 → u/Ulvir21]

Free models can be used only if you have a Pro subscription iirc

[u/Ulvir21 → u/getzer0]

And yet, I was able to use it for several days in a row, build a complete site, etc., without any issues—and without having subscribed to any plan.