When I open the Forge installer it comes. Do you know what I can do to make it work? Didn't find anything about it on Youtube. Is Forge for 1.12.2 (but was also the case with the other versions)
You have a faulty or not installed Java.
Ok how can I change that? I've already suspected that, the only problem at the time was that I downloaded Java again and it still didn't work.
I downloaded it again, but it still doesn't work.
You need Jarfix