Aternos ticking entity crash

So, today I was playing on the modpack stoneblock 1 using my free aternos server and everything was going like normal so i went to open some chance cubes in the mining world and i opened one that started a boss fight between me and a witch and then it crashed the server instantly, i have tried restarting it and disabling mobs then restarting it but it crashes every time i try to start the server again, in the error it says it is a ticking entity crash, here is the full crash report: https://pastebin.com/Qmv185bg . Any help would be appreciated because i put a lot of time into the server so i really want to keep it rather than resetting it unless there are no other options.

Hey, thanks for trying to fix it but it did not work i kept doing /kill @e[type=item] in the console but it said nothing was found, i think it is because it is doing it in the overworld rather than the mining world but i am not sure, also when you said try removing that, if it meant removing the cyclic mod I couldn't find a way because there is no mods folder in the files as i know of as i cannot see it there. Thank you again for responding.

Update: I fixed it by using nbt explorer to teleport me into the overworld then i went into the mining world and did kill @e whilst being in there from my client and it worked, thank you for your help.