I get a crash whenever i place the block and it just started happening. Here is the crash report:

https://pastebin.com/2NQRLHff

Also, i have vanilla fix installed, and whenever i look at the barrel i get this error: (Not a crash, just a warning)

https://paste.dimdev.org/vimesebezu.mccrash

I'm also getting this error:
https://paste.dimdev.org/ujacepehas.mccrash

I tried using the fill cmd to fill it with air, it gave me an error. I tried using worldedit, same thing.