So for the past year or so, I've been using "Sign Avatar" as my avatar rotator on the "Toho Kingdom" Forums. over the weekend I took it off so I could use another avatar temporarily and I had done this before in the past, however today I tried to plug it back into my Toho Kingdom Forums profile and this pops up everytime "The URL you specified is invalid." and it doesn't seem to be the link's problem as the gif still works perfectly.
Does anyone know how to fix this?