Give it a bit of time, it looks like the server for those particular Tinkers is down. It'll come back in a while. There are still a few dozen more servers that are up. You can let the machine wait until it can see the server or you can take it off deadlineless until it's back. Depending on what sort of machine it is you could draw a WU that takes up to a week to crunch, though it might hurt your points to have the box sit at idle until the network comes back up.
If it were my box I'd sign it up for regular WUs for now just to get it working. Later, in a day or two, I'd put it back on deadlineless where it sends and recieves 10 WUs at once.