Please share the launch link you are trying. Or the source repo.
Usually, if it had been working and nothing was changed, it just means you need to give the system time to start a new node / work out the hiccup.
Note the parent organization has been warned in the past about their use of mybinder.org for delivering $1200 for-profit courses.
nothing was changed
This is among the issues, as they seem to have historically generated uncacheable images.