I've started to get this message every time I load up my world, and I don't know what it really means:

Would this have to do with the new modtweaker update? I also think this may have to do with me disabling some base metals in replacement with custom base materials in my script.

Versions:
Minecraft: 1.12.2
Forge: 2618
Contenttweaker: 4.4.1
BASE: 3.6.1
Crafttweaker: 4.1.3
Modtweaker: 4.0.7
MTlib: 3.0.2

Here is my material script: https://pastebin.com/KZPhk9BB

It's nothing bad. Just a warning really. I'm trying to find time to fix it, but I also believe Jared was working to make it so that it doesn't log to chat.

ok, cool, thanks for the update, it seemed to work.

Crafttweaker 4.1.4 Silences this output to the chat.