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if you installed a mod then do options force update on the login screen. if you did not have mods then you can do anything about the crash report unless you are a computer geek.
Close minecraft and then reopen it. Repeat until working.
Please tell me the problems on your server.
Turn on the sound
All you have to do is delete your .minecraft folder and run Minecraft agian. It will make a new one, then try installing it agian.