My server starts and stops directly

I was playing since last week on my aternos FTB SkyFactory 3 3.0.15 server with some friends and now after waiting the queue it say "starting" for about 5 minutes and then "stopping". This happens each time I try and it was working fine until today. There's the log.

Thank you in advance for any kind of help.

Edit: I just tried running the world save on singleplayer and it seems to work fine.

I reinstalled the server and saved the world and the server opens but my world is now like a brand new world but it didnt reset everything: my checkpoints are still there ad some other options.

Help! I dint want the server to format my world but just to load it...

Thank you it worked