Hello there!

Im getting server crash - here you are -> http://pastebin.com/Zw6grpn0

So, what now?

You need to remove other mods and choose each core mod once to test this error happens when which core mod is installed. Mostly Core Mods have names like "one's lib(rary)" "one's util" "one's core".

I updated Cauldron to newest version and it looks like all is right.

Redisual Heat block-- You need to disable them.

There is only one possible way that function could crash with a Null Pointer Exception, and that's if someone made a Core Mod that alters Block.onEntityCollidedWithBlock(). And that's because by default, its an empty function. Cauldron is also a possibility.