Do not run the Sponge server

Logs [19:50:37] [Server thread/ERROR] [FML]: A problem occurred instantiating the inj -
Crash report ---- Minecraft Crash Report ----WARNING: coremods are present: llibrary ( -

You have a plugin that is requiring a economy plugin which cannot be found.

Just get a economy plugin, or find out what plugin is causing it and disable the economy side of it (if it allows you)

What are good 1.12.2 plugins for an economy survival server?

You would need to ask the devs.

Most plugins I know that have a economy side to them allow you to disable it.

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Alright, thank you!