Mcreator is broken

This problem has been bothering me for 3 months with mcreator.
I wanted to make a normal mod with mobs that have animations.
But of course mcreator won't let me (who would have guessed).
I installed the nerdys geckolib plugin and created a model in blockbench. I uploaded everything to mcreator (remember that both geckolib and mcreator are on version 2023.4)
I set the texture for the mob and tried to open the client.
Of course, I couldn't see the mob in the game because it kicked me out of Minecraft after 5 seconds. It's like this every time. I'm sure I wrote the animations well so it couldn't have happened because of that.
There is also a problem with the tetxurs of custom blocks, which in the game are pink and purple pixels.
You can't work with something like that.
Please, someone tell me what happened.