Nitrado Server can no longer be started?

I bought a nitrate minecraft server. Now I have loaded mods on it, but now it no longer works. I already looked in the error report but I don't understand what it means.

Throw all mods back down and check whether it works…

then upload mod by mod individually and try each time again to see if it is still running…

this is the only way to find the flawless mod that you are sure to have…

You probably forgot to delete the client-side mods.