The game crashed whilst initializing game Error: java.lang.IllegalArgumentException: value already present: null

It does not give the option to select 1.7.10 in the "Affects Versions" above so there is another bug for you.

I write in because I've been playing 1.7.10 for a little over six years.  I have the combination of mods that I enjoy and just about two weeks ago an update occurred and now 1.7.10 WILL NOT LOAD AT ALL.

The error that appears is: The game crashed whilst initializing game Error: java.lang.IllegalArgumentException: value already present: null

 

I have attached the crash report.