After looking at your log file I have noticed that it says "exoticbirds:" which makes me think that there are mods. In your mods folder is there any mods? I recommend making a backup of your .minecraft folder and then deleting everything in there. Then try to reinstall minecraft and then forge
After reading this, I deleted the whole .minecraft folder, made a new one and ran Minecraft. Then I installed Forge with the installer on the fresh copy of the game. Sadly same error. Thanks a bunch for the help though. I do appreciate the effort.