Folding@home's userbase has increased about 10x over the past several weeks, which has flooded the servers under the load and exhausted workunits faster than they can be generated. When the queue is empty, the server says "No WUs available for this configuration". The research teams are rapidly setting up new servers and getting more projects into the queue, including for the Wuhan Coronavirus, so hopefully that can keep up with demand soon. In the meantime, keep everything running and the software should pick up workunits when they are available.
F@h is now the top computing platform on the planet and nothing unites people like a dedicated fight against a common enemy. This virus affects all of us. Lets end it together.