What does failed to fetch mean?

Technically it's not a big problem, but it makes users feel uncomfortable. Fortunately, to solve this problem, users only need to delete the ultrasn0w source on it.

If you need to use in the future to add this source can, I believe that at that time Ultrasn0w source should have been able to work properly, will not cause trouble to users.

Here to remind everyone is that no matter when the user encountered the "Failed to fetch" problem, the deletion of the source method is applicable, and then need to manually add it again.