You have some problem on a world which is corrupted. try to download your world and go to its playerdata file and delete it and upload your world again
It doesn't allow me to download the world. I click it and it does nothing.
Posts by Zalor
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Whenever I try to start my server it stops almost instantly with 2 error messages
https://gyazo.com/d63f1e70ccc84e503acd76dfa2dfd1ad
https://gyazo.com/85fb13e2ef099a98d80e3966de5206c0