Aternos Server Keeps Crashing During Startup

Hey! I've been trying to start up an Aternos server a friend and I have been using for about 2 weeks. However, during the startup process, the server continues to crash and has been doing so for 3 days. Can anyone give me any help? The log is on this link: https://mclo.gs/vNeSTi4

We are using Curse Spacecraft version 1.1.0

I would rather keep that world. It has a lot of progress on it.

It works. It works if i change the world.

Update: I tried using the backed up world and it launches now. However, I am now incapable of actually interacting with the world as within a minute of me joining, it boots me with an "Internal exception java.io.ioexception an existing connection was forcibly closed by the remote host" message.