Suddenly crashing on launch.

[Zii]

Server has been running fine until a restart today, at which point it crashes partway through load. I've tried swapping out the modpack to a fresh server and it boots fine, but if I bring in the world file it causes the crash so I'm guessing something is wrong in there but I have no idea how to read and understand these logs, so any advice on what to do next would be helpful, thanks!

Here's the log:
https://api.mclo.gs/1/raw/jYzFXVR

Edited March 25 by Zii

[TileEntity]

The level.dat contains an invalid tag ID (115)

Try to load the world in singleplayer - then test this world on the server