I've installed Forge 1.12 and Optifine 1.12. When I run Minecraft with Optifine in the mods folder the game crashes. But when I take out Optifine from the mods folder the game just works fine.
Is Optifine the only mod that you are using? If so, try installing it by itself - it does not need Forge and is currently incompatible with it; it will also probably run better by itself since Forge adds a lot of overhead:
I've installed Forge 1.12 and Optifine 1.12. When I run Minecraft with Optifine in the mods folder the game crashes. But when I take out Optifine from the mods folder the game just works fine.
Here is the crash log
https://pastebin.com/6KAf4mHz
Is Optifine the only mod that you are using? If so, try installing it by itself - it does not need Forge and is currently incompatible with it; it will also probably run better by itself since Forge adds a lot of overhead:
http://www.minecraftforge.net/forum/topic/58916-minecraft-112-crashes-with-forge/
ETA: An older version of Forge may work, but again, unless you are using Forge for other mods I suggest using Optifine by itself:
http://www.minecraftforum.net/forums/mapping-and-modding/minecraft-mods/mods-discussion/2833996-looking-at-this-crash-report-is-the-problem-forge
TheMasterCaver's First World - possibly the most caved-out world in Minecraft history - includes world download.
TheMasterCaver's World - my own version of Minecraft largely based on my views of how the game should have evolved since 1.6.4.
Why do I still play in 1.6.4?
Thanks it works well with only Optifine. I was using Forge for Shaders Pack but I learned Optifine does the same thing.