Geckolib stopped working for me. (Animations not playing despite being set to the right ones.)

Hi, I've used Geckolib and Mcreator before for my Prehistoric Park mod. Now, with a new small project of mine, i'd like to use it again. But i'm having problems with the animations of custom entities. What's happening is that rather than the walk animation working, it plays the idle animation instead as it walks even though I set it to use the walk animation the same way I did it with my Prehistoric Park mod and I don't understand why this is happening.