Fatal error in Metadata/Monsters/Quadrilla

Fatal error in
Metadata/Monsters/Quadrilla/IcyQuadrillaBossMinion1@34:
Number of shared states is different on client and server! Delta: 164

cant log in anymore ~

I also crash all the time when playing with my friend who is playing Spirit Walker with the Monkey boss. It always happens the same way, we get too far apart, he comes back towards me, instant crash to desktop with a similar error message. Happens about 1-2 times per map unless we stay pretty much on the same screen.

He has also crashed from me Spirit Walker Twister build. He gets the same message but it says it is from a twister. Though this has only happened once to him. Where I crash constantly to the point I don't want to play with him.