I don't really know what a Hen Base is, is it the hen or a spawner?
And I'll try to download the newer version, ty.
It seems so be working now after I removed DynamicSurroundings, although I really wanted to play with that mod. I don't understand why it stopped working right then and there, as I have hours of footage where it works anyways without issue.
So, I was playing on my little modpack (consisting of many random mods) and I had been playing for hours (couple days actually) without issue. I had led some animania chickens into a small temporary pen and went to break one of the blocks so I could get in and out without issue, when I got a strange error.
Thinking nothing of it, I launched it two more times before immediately getting the same error, and I'm not sure how to fix it. Nothing online seems similar.
My Mod list:
-animania (base, extra, and farm)
-Custom Mob Spawner
-Galacticraft (Core and Planets)
-Rex's Additional Structures