Hello peoples of the forge forums. One of my friends owns a modded FTB F.A.M server, and I keep trying to join it, but every time I get past 'loading terrain,' the screen goes grey, then it tells me 'saving world' before promptly crashing my game. I don't know what is causing it, but my friend hasn't played in a while, and a couple of the mods are out of date. I downgraded the Immersive Engineering and Advanced Peripherals mods to match with the versions that their server uses, but I feel like that shouldn't be the cause of the crashes as it says that the mods load correctly in the console while joining the server. I also have the instance installed on an SSD, and I gave it a whole 8-10/32 gigabytes of my ram. 

Here is the crash log:
https://pastebin.com/YpgvXJbH

Any help would be greatly appreciated. 

I figured out the problem eventually. My friend didn't know that entire new versions of the mod pack had come out and thus all I needed to do was try all the previous versions until one worked. There were a lot of mod updates despite the game only telling me that two mods were out of date.