Minecraft Server Crashed

I added Bukkit to my server so me and my friends could use /home but when I tried to start the server it just crashed. I went back to a previous backup, downloaded the world and then tried to upload the world from there and download Bukkit but it still doesn't work. I have the Pixelmon mod and forge on my server as well, but it works perfectly fine. Here are the logs: https://mclo.gs/XvyAxRy

Quote from Toothy

Since you are on 1.12.2, for mods AND plugins, you have to use Magma

Oh thank you! I don't really know anything so this helps me a lot!

Wait quick question. I use forge to launch Pixelmon to play, so do I have to download something new to play?

Quote from Toothy

Magma is forge and paper/bukkit combined, so you can have forge mods and spigot plugins

Thank you!