i have made a server with a costume modpack but when i join the server games crashes

So i have made a modpack collection for my server,when i play in singleplayer it works fine no crashes no stutters no nothing but whenever i try to join my server(i have set it up with shockbyte and everything is fine server side)my game crashes when it goes to load the map and returnes a exit code:-1 error.I am not using any shaders and i have already checked all of my drivers and they are up to date but 3 more people have tried joining as well and the same thing happens to them.As this is the first time that this is happening i dont know what i can include to help you get an understanding of what is going on.