Hello everyone, I have problems with the mod on 1.12.2

I need to make 1 mob with a custom model, however, when starting minecraft, it gives the following error -

C:\Users\741\MCreatorWorkspaces\haggi\build\sources\main\java\net\mcreator\haggi\entity\EntityHaggi.java:140: error: cannot find symbol    public static class Modelhaggivaggi extends EntityModel<Entity>{ 
                                               ^
  symbol:   class EntityModel
  location: class EntityHaggi
C:\Users\741\MCreatorWorkspaces\haggi\build\sources\main\java\net\mcreator\haggi\entity\EntityHaggi.java:602: error: cannot find symbol       public void render(matrixStack matrixStack, iVertexBuilder buffer, int packedLight, int packedOverlay, float red, float green, float blue,
                         ^
  symbol:   class matrixStack
  location: class Modelhaggivaggi
C:\Users\741\MCreatorWorkspaces\haggi\build\sources\main\java\net\mcreator\haggi\entity\EntityHaggi.java:602: error: cannot find symbol       public void render(matrixStack matrixStack, iVertexBuilder buffer, int packedLight, int packedOverlay, float red, float green, float blue,
                                                  ^
  symbol:   class iVertexBuilder
  location: class Modelhaggivaggi
3 errors
:compileJava FAILED
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
BUILD FAILED in 1s
5 actionable tasks: 3 executed, 2 up-to-date
BUILD FAILED

Cod model - https://pastebin.com/ZEZFM7W3