PeppiCola

Please help! So, I have a few mods that are 1.7.10 along with optifine 1.7.10 and forge 1.7.10. When I have optifine in my mods folder, my game crashes loading up at the Mojang screen. However, when I take Optifine out of my mods folder, it loads up fine. I don't think it has to do with the mods, but optifine is making some error. Please help! -Thanks!