When I try to log on my mc crashes

Bug: When I try to log on my mc crashes

IGN: Gladiator_Derp12

Date of Bug: 06/05/2016 (English goes day/month/year

Summary of Bug: When I log onto the server my mc crashes and says
AL lib: (EE) alc_cleanup: 1 device not closed
Java HotSpot(TM) 64-Bit Server VM warning: Using incremental CMS is deprecated and will likely be removed in a future release.

No clue what this means but it was after I tried to log onto the server after a good year

Evidence of Bug:

Additional information:

 

Hey there, are you using 1.9? If so, I would switch back to 1.8. If you don't know how to do that, click here: http://www.howtogeek.com/203196/how-to-change-your-minecraft-game-version-and-set-up-profiles/ That should fix it. If not, let me know