Forge doesn't start up with OptiFine

[Guest]

I installed the latest Forge version with the installer.

Then I opened the MC launcher, started the Forge profile (its version is called '1.8-Forge11.14.0.1299').

Everything worked fine, MC started, I could join servers and so on.

After that I tried to start it with Optifine. So I put the optifine.jar (latest; 'OptiFine_1.8.0_HD_U_C7.jar') in the mods folder.

Then I tried to start the Forge profile again - the Mojang logo showed up, then it crashed.

I even tried another OptiFine version, but nothing changed.

 

I also searched on Google for tips and help, but the only thing I found was useless.

 

Here is the crash log:

http://pastebin.com/M8eXAV2B

 

(The Rules/EAQ thread says I should post another log, but there weren't any others.)

[AylaAsperger]

I had the same problem, when I tried to update forge beyond 1290. I kept downgrading untill I was back at version 1290, and that one still works with optifine. So untill optifine is updated to work with the newer forge versions I suggest you downgrade forge to build 1290.