Trying to upgrade buildings, but the required item is missing from the cutter. Unless the only way to make these is with the villagers themselves?

Can I get any assistance with this? You replied with an answer that does not pertain to my issue, immediately closed the topic and have not responded to my other comment.

Tried a binary search to work out which mod is causing the problem?

You can try a binary search
The binary search is a way of finding a faulty thing among a lot of other things without having to remove the things one-by-one.

This is useful for finding a broken mod among hundreds of mods without having to spend time testing the mods one-by-one.

The procedure is simple:

1. Remove half of the existing things, and put them aside.
2. Run the program / game.
3. Does the issue still exist?

• If YES: Repeat from step 1 with the current things.
• If NO: Swap out the current things with the ones set aside, and repeat from step 1.

4. Repeat this process until the problematic thing(s) have been found.

There are 2-3 mods that interfere with block mods like DO. Diagonal Fences, Epic Paladins are two of them, else you might have to try binary

Remove the epic paladins mod

Don't have it installed