SF4 works fine for singleplayer...But not multiplayer

So, me and a group of friends decided to play some SkyFactory 4 together on Aternos. Someone in our group volunteered to create the server, and so he did. And this is where the problem begun. Me and another friend tried connecting to the server, but when we were in the loading screen, our game just completely crashed and went back to Tlauncher. (The launcher that i use to play Minecraft). I received a crash report listing the reason it crashed, but at first i thought nothing of it, basically not reading it and thinking that i just had too many chrome tabs open which filled up my CPU and was probably the reason my game crashed. So i tried again, same thing happened. Loaded into a server, mere seconds away from loading into it before my game crashed. This time i decided to read the crash report, and the reason was apparently because of other mods that might be making the game crash for some reason (If anyone wants me to, i can later edit this post and send a screenshot of the full report). So, i uninstalled every other mod apart from the ones in the SkyFactory 4 modpack. I try again, same thing happens. At this point my friends just told me that it was probably because of my RAM (I have 8gb of Ram), but another one of my friends didn't have any problems loading into the server, and he had the same amount of RAM as me. So, i've basically tried everything at this point and i've got litteraly no clue how to fix this. Any help would be greatly appreciated! Oh and yes, i did attempt to create my own server but still the same result.