My server keeps on crashing

So, my minecraft server on Aternos keeps on crashing, a few days ago it was just fine but now I can't even enter it. It usually says 'Connection lost' or 'Connection Refused' Can someone please help me? Here are my logs:https://mclo.gs/kdhiECU

Quote from Roman

Your world seems to be broken: https://mclo.gs/kdhiECU#L33

Try to generate a new one

So I click 'generate' ?

But won't that erase all of my progress..?

Quote from Roman

Your world seems to be broken: https://mclo.gs/kdhiECU#L33

Try to generate a new one

Also how do I generate a world? Like what do I enter at the 'Generator' part

Like I fill in World name,seed etc but what do i enter in Generator?

Thank you a lot it started working like normal