Yaintve

Posted this in general but realized this is a better place. I updated my server to Spigot 1.17 and created a backup of it on Paper 1.16.5 just in case. The update was laggy for me and the rest of my friends while playing, so we decided to revert back to 1.16.5. I restarted the server and clicked restore server, but then it said "An Unknown Error Occurred" when trying to launch it, and now I can't even open the server/world and I'm scared that I messed everything up even though the backup was made. What happened/what can I do? Every time I or any of my other friends on the server tries to open the world via the Minehut server doing /join, it just sends us back to the lobby. This is the latest log as of trying to open it: https://pastebin.com/BxVWsQUM

I updated my server to Spigot 1.17 and created a backup of it on Paper 1.16.5 just in case. The update was laggy for me and the rest of my friends while playing, so we decided to revert back to 1.16.5. I restarted the server and clicked restore server, but then it said "An Unknown Error Occurred" when trying to launch it, and now I can't even open the server/world and I'm scared that I messed everything up even though the backup was made. What happened/what can I do? Edit 6/13/2021, additional info: Every time I or any of my other friends on the server tries to open the world via the Minehut server doing /join, it just sends us back to the lobby.