Crash on Start after Forge Install

[Sigyn]

I haven't played in 2 years so please forgive my noob status.  I installed Forge & launched the game (1.12).  It comes up with "Game Crash.  An unexpected issue occurred and the game has crashed.  We're sorry for the inconvenience."  Forge installed just fine.  I tried the recommended & the most recent versions for 1.12.  Both result in the same crash.

 

Here's the log file: https://gist.github.com/anonymous/d1f141505576dd368a35b991a77c5787

 

I haven't installed anything other than Forge at this point. I have played a vanilla 1.12 world for several hours. 

[Choonster]

The log explains exactly what the problem is and how to avoid it:

Quote

[20:32:09] [main/FATAL] [FML/]: There appear to be jars extracted into the mods directory. This is VERY BAD and will almost NEVER WORK WELL
[20:32:09] [main/FATAL] [FML/]: You should place original jars only in the mods directory. NEVER extract them to the mods directory.
[20:32:09] [main/FATAL] [FML/]: The directories below appear to be extracted jar files. Fix this before you continue.
[20:32:09] [main/FATAL] [FML/]: Directory beheaded-1.7.10-0.3.1-UNIVERSAL contains [MANIFEST.MF]

 

Aside from that, 1.7.10 mods won't work on 1.12 (except under very rare circumstances where the mod doesn't use anything that's changed between Minecraft versions).