I am aware there has been many posts like this one but I can't seem to find it anywhere on the internet.

 

"A fatal error has occurred, this connection is terminated"

 

My log has been attached.

The mods I'm using are: BetterFPS-1.4.8, BiomesOPLenty-1.12.2-7.0.1.2384, MapWriter-1.12.2-2.8.2, OptiFine_1.12.2_HD_U_D3, PixelEtras-1.12.2-2.3.6, PixelmonGenerations-1.12.2.2.0.3

I'm running Forge 1.12.2 and Java 1.8.

 

I'm using my own custom modpack and I cannot log into a server or a singleplayer world without it giving me this error. Any help wiith this issue will be appreciated.

I'm not good with this kind of thing.

Ross

 

https://www.dropbox.com/s/r00z59cfjfboln5/latest client.log?dl=0

 

https://www.dropbox.com/s/uiut3o9z2gupb2g/latest server.log?dl=0

 

Both files.

 

 

Ah see now that's the mod I'm attempting to run, let's call it the most important mod. Any way I could work around it?

Contact them and ask them to fix the issue.

They use this internal method is a half-baked anti-cheat system. It was doomed to fail from the beginning as it requires the server to trust the client. Not to mention it bypassed all the other ways  mods are loaded.

But ya its internal API that isn't garenteed to work.