Welcome, @riksub
The UseGalaxy.eu server upgraded to the next release of Galaxy, and that impacted some functions. All is working now, so please give this another try. Thanks for reporting the problem!
Details are in this other topic →
If you still find the function you are using problematic with the rerun, please let us know! 
If you are actually working at UseGalaxy.org instead (how the question was labeled?), I would suggest also trying again first, then let us know and I’ll review this closer (we were also restarting for the upgrade over the last few days).