Dear Edmond,
sorry for the late reply.
The public Phobius servers are not very stable and can become unreachable from time to time.
In case you face this error again, my only suggestions is to retry after some hours or days.
We are working on a self-hosted Phobius solution to get rid of the dependency to the public Phobius servers, but this will still take some time to implement.
kind regards,
Ulrich