I'm launching minecraft version 1.12-forge1.12-14.21.1.2443 with LittleTiles and CreativeCore and it crashes on startup, even before I see the forge loader screen. These are the mods I've got installed:

• CreativeCore_v1.9.80_mc1.12.2.jar
• LittleTiles_v1.5.0-pre186_mc1.12.2.jar

I've uploaded my crash report:
crash-2019-12-21_10.58.56-client.txt

You're playing on Minecraft version 1.12, the mod is for 1.12.2.