All EnderIO machines that take RF.
There are complaints in the crash report that reference certain mods (different in different reports) using outdated RF API versions.
Case: https://github.com/SleepyTrousers/EnderIO/issues/3069
Fix is in 2.3.0.424_beta version of EnderIO.
FTB Team please...
You should update the mods, configs and scripts folders usually.
Just be sure not to delete/move the world folder from your server, this is where the map data is. If you want to be extra sure, remember to copy/backup that folder before you update.