Hey there,
My server runs perfectly fine when I try to use it if it is set to vanilla minecraft. It also works with paper/bukkit, and forge with mods. However when I attempt to use a modpack, I press start, it doesn't even send me to queue, it simply says loading, then after about a minute it says starting. It stays on starting for quite a while and then it appears red saying crashed. It tells me to check the log however I don't really understand it. I have tried multiple modpacks and it doesn't work.
Basically, my server only crashes when I try to start it with a modpack.
Anyone know why this may be happening?