After blacklisting some dims in the config i always get this crash :

java.lang.IllegalArgumentException: Could not get provider type for dimension 0, does not exist

at net.minecraftforge.common.DimensionManager.getProviderType(DimensionManager.java:164)

at net.minecraftforge.common.DimensionManager.createProviderFor(DimensionManager.java:325)

at net.minecraft.world.WorldServer.<init>(WorldServer.java:110)

at net.minecraft.server.integrated.IntegratedServer.func_71247_a(IntegratedServer.java:121)

at net.minecraft.server.integrated.IntegratedServer.func_71197_b(IntegratedServer.java:156)

at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:486)

at java.lang.Thread.run(Thread.java:745)

You've blacklisted dimension 0, 0 is the overworld and NEEDS to be enabled.

Remove 0 from the blacklist and all should be good