When I am loading into my world, I get the following error:
software.bernie.geckolib3.geo.exception.GeckoLibException: thorium:geo/gresk.geo.json: Could not find model. If you are getting this with a built mod, please just restart your game.

My folder structure looks as follows:

and my procedure follows the guidelines as per the geckolib guide posted on the mcreator forums.

MCraptor isn't supported.