When I installed Forge, it all worked perfectly. But when I try to use it (with no mods) it gives me this error:
And when I go to that website it doesn't exist (404), even when I make it WorldCore/WorldCore-..., and there is even no ...net/WorldCore at all.
How do I fix that?
Also, why is it 1.7.2 when I installed 1.6.4?