Everytime our savegame hits 48h 35m 46s suddenly the client freezes and an error code appears..
We tried several commands via console like deleting all biters and nest etc. Also one Error in the log-file told us there is something wrong with an explicit coordinate, but this location is about 30.000 blocks far away and we've never been there before.. I tried to teleport there and killed all biters / spawners aswell.. But nothing changed and the game still crashes
No clue what to try next.. Any help is welcome!

edit: added the mods folder