How do I fix the "Error: Could not find or load main class net.minecraft.launchwrapper.Launch" problem?
I was originally using 1.12 with Forge then 1.12 alone but then when I saw people were saying the snapshot worked I tried using snapshot 17w43a and it did not work. It showed the same message that it showed on the others.
The snapshot sounded like a good idea. I went on and it loaded for a minute and then went right back to the error.
Update: I replaced my mods folder with a new folder. I took all my mods out of mine craft. Loaded it and it loaded fine. I then made a new folder on my home screen and named it Mods and added all my mods to this folder and replaced the original mods folder with the new one. Now my Minecraft is working with both forge and mods.