Failed to start the deployment due to an internal error (fresh, tiny, site)

I just created a new pages.cloudflare.com site deployed from GitLab. It only has one tiny text page. I’ve tried leaving the build settings at the defaults and switching to Eleventy. But in all cases I just get this unhelpful error:

13:22:35.972 Initializing build environment. This may take up to a few minutes to complete
13:22:35.972 Failed to start the deployment due to an internal error

Hi, this seems like an issue on our end. If you were able to previously deploy your project, can you share the .pages.dev URL? If it failed from the get-go, please shoot me an email with your account email: azhao at cloudflare.com

It’s a completely new site. I sent you an email.