It may be a server-wide problem.
The same happens to mine radiobee aligner - a Hugging Face Space by mikeee which ran Okay previously.
Logs say Successfully built 989912a9c4b6 Successfully tagged space-cpu-mikeee/radiobee-aligner-8dd688d44271d792c7b84f717e8e285aae89f07c:latest
Yet the app does not run – a Build error shows up.