trying to use any sort of custom models for mobs causing errors

when i try  to use any sort of custom models for a mob it causes the following errors in console, any fix?

C:\Users\TFAU\MCreatorWorkspaces\mod\build\sources\main\java\net\tfau\mod\entity\EntityVinb.java:244: error: cannot find symbol public static class Modelmarg2 extends EntityModel<Entity> {
^
symbol: class EntityModel
location: class EntityVinb
C:\Users\TFAU\MCreatorWorkspaces\mod\build\sources\main\java\net\tfau\mod\entity\EntityVinb.java:456: 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 Modelmarg2
C:\Users\TFAU\MCreatorWorkspaces\mod\build\sources\main\java\net\tfau\mod\entity\EntityVinb.java:456: 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 Modelmarg2
3 errors
:compileJava FAILED