--See dark utils references in pastebin of console dump from dedicated server run startup sequence. I'm seeing quite a lot of error messages thrown out.

-Minecraft 1.15.2
Forge 31.2.36
-DarkUtilities-1.15.2-3.1.8.jar
-Bookshelf-1.15.2-5.6.40.jar

https://pastebin.com/10sVfLi6

Those are recipe errors for content that hasn't been added back into the game yet. They can be safely ignored.

Ok