Mcreator gives error when I use exported entity model from .jar file

Hello, I want to create this mod:" Mutant Nether Mobs Mod." I wanted to start with Mutant Zombie Pigman, for it I need Mutant Zombie entity model. I couldn't find that model anywhere I want. So I decompiled "Mutant Beasts Mod" .jar file. And I tried a file It didn't work. I found a new Mutant Zombie Model .java file. I exported it. This wizard popped up: https://drive.google.com/open?id=1oYSnYQTu3dmhoN2hrWt_3Ck0Up8g1RyN

First, I didn't set any animations and I got compile error. Then I tried some animations, but same error again. How I can fix that error?

Log:

C:\Users\Administrator\MCreatorWorkspaces\testii\build\sources\main\java\net\mcreator\testii\MCreatorMutantZombie.java:252: error: cannot find symbol
		public void animate(final MutantZombieEntity zombie, final float f, final float f1, final float f2, final float f3, final float f4,
		                          ^
  symbol:   class MutantZombieEntity
  location: class ModelMutantZombieModel
C:\Users\Administrator\MCreatorWorkspaces\testii\build\sources\main\java\net\mcreator\testii\MCreatorMutantZombie.java:543: error: cannot find symbol
		protected void animateThrow(final MutantZombieEntity zombie) {
		                                  ^
  symbol:   class MutantZombieEntity
  location: class ModelMutantZombieModel
C:\Users\Administrator\MCreatorWorkspaces\testii\build\sources\main\java\net\mcreator\testii\MCreatorMutantZombie.java:685: error: cannot find symbol
		protected void animateDeath(final MutantZombieEntity zombie) {
		                                  ^
  symbol:   class MutantZombieEntity
  location: class ModelMutantZombieModel
3 errors

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileJava'.
> Compilation failed; see the compiler error output for details.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUİLD FAILED in 21s