1.7.10 packs wont launch sometimes and when they do i cant creat a single player world

[DAMTI]

Title:

1.7.10 packs wont launch sometimes and when they do i cant creat a single player world​

Launcher Version:

1.4.11​

Modpack:

any 1.7.10​

Modpack Version:

any​

Log Link:

​

Details of the issue:

every time i try to creat a single player worlds the game crashes and the crash log gives me the following massge
java.lang.ExceptionInInitializerError​

 

[splashblue]

Do you use Java 8? Some packs won't work with Java 7 anymore.

 

[mc.crab]

Also posting the full log would be good.

 

[DAMTI]

Im using java 8 64 bit and still get the problem.
This is the message it get after the game crashes and it happens in vanilla aswell:
Stopped webserver with error: java.lang.NullPointerException