Got this error on startup:

109.784 Error ModManager.cpp:1514: Failed to load mod "leighzerscienceores": leighzerscienceores/data-updates.lua:64: attempt to concatenate field 'order' (a nil value)
stack traceback:
leighzerscienceores/data-updates.lua:64: in main chunk
109.789 Loading mod core 0.0.0 (data.lua)
110.370 Checksum for core: 3692526182
110.638 Error ModManager.cpp:1514: Error in assignID: recipe-category with name 'crafting' does not exist.

Source: default (utility-sprites).
110.762 Initial atlas bitmap size is 16384
110.762 Created atlas bitmap 2048x560 [icon, not-compressed, mipmap, linear-minification, linear-magnification, linear-mip-level]
110.784 Texture processor created (2048). GPU accelerated compression Supported: yes, Enabled: yes/yes. Test passed. YCoCgDXT PSNR: 35.83, BC3 PSNR: 33.82
110.835 Parallel Sprite Loader initialized (threads: 11)
110.978 Sprites loaded
110.993 Generated mipmaps (5) for atlas [0] of size 2048x560
110.993 Custom mipmaps uploaded.
110.998 Factorio initialised
110.998 Discord overlay detected (DiscordHook64.dll)
111.004 Mods to disable:Failed to load mods: leighzerscienceores/data-updates.lua:64: attempt to concatenate field 'order' (a nil value)
stack traceback:
leighzerscienceores/data-updates.lua:64: in main chunk

Mods to be disabled:
• leighzerscienceores (0.3.3)

Could you provide the list of mods you were trying to use when this error occurred?

The big ones that come to mind are Space Exploration, Factrio and Conquer: Tiberian Dawn and Prospector. I'll draw you up a full list later when I can, heading into work now

Well I haven't finished typing up the list but I did track down the culprit. It's Tiberian Dawn. I was tracking down another bug anyway so stripped back the mod list to nothing

Ah yes I see what is happening, I'll work on a fix for that and thanks for pointing it out.

I'm still working through how compatibility will work with other mods, and which ones I'll provide support for.

Space Exploration in particular is looking like a large undertaking that I am unsure if I will take. For now this mod doesn't officially support anything beyond vanilla.

Yeah that's fair enough, I didn't expect to find Space Ex science ore patches with this anyway. Just wanted a way of jump starting certain techs before the infrastructure was in place to focus on that tier