Why exactly does the Aternos server crash?

I play friends on a Minecraft Aternosserver. The problem now is that the server keeps crashing and I can't read the block because of which. The server also gives me 2 options for the solution:

Remove the file "world"
Remove the block with MCEdit

Of course, I don't want to erase the world, it's more than 2 weeks of work, but I don't understand which block is meant in the error message. Can someone read that out? The marked line should show which block it is, but I don't see the block in the line and neither in the following.

If it helps, it runs on the modpack server: FTB Ultimate Reloaded.

Looks like a crash because of an industrial continuous fluid pump

Ok, it could be the Fluid Pump that I use to pump oil, but I built it a week ago, why should the server suddenly have a problem with it?

https://github.com/....java#L101 seems to be trying to interact with a non-existent block or the fluid handler. So either turn off the fluid pump, but updating could also help, since the fluid pump seems to be recoded in 1.12.2

Or there's none in 1.12.2 but kp