Click edit profile in minecraft launcher.
Enable JVM Arguments.
Put this in the box: "-Xmx2G -XX:MaxPermSize=128M" -> without "" ofc
this should work 
And your problem as said in the crash is: Caused by: java.lang.OutOfMemoryError: PermGen space
The Arguments should fix it
Posts by Goldern
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Im just going to make a new client from scratch.
You should try this modpack:
Working fine here
