So im starting to have this problem, i just play with 2 friends, for fun, and we get the server crashed everytime we are exploring.

if some can help me would be awesome, we jsut wanna keep playing this awesome modpack, thnks.
Ask for any archive or whatever, ill repond asap. thnks :D

You have not provided a crash report.
The console output you are showing makes no references to MrTJPCore.
You have not specified what Minecraft Version you are using, Modpack, or mod version.