I can't create custom entity

Hey guys I have some issues with making custom models for entities. Ive made everything as it was in yt tutorial but then it shows me something like this 
Pls help!

Executing Gradle task: runClient
Build info: MCreator 2021.2.36710, forge-1.16.5, 64-bit, 8134 MB, Windows 10, JVM 11.0.11, JAVA_HOME: D:\Mcreator\jdk
> Task :compileJava FAILED
D:\TEST\src\main\java\net\mcreator\testowe\entity\renderer\PolRenderer.java:44: error: net.mcreator.testowe.entity.renderer.PolRenderer.Modelcustom_model is not abstract and does not override abstract method render(com.mojang.blaze3d.matrix.MatrixStack,com.mojang.blaze3d.vertex.IVertexBuilder,int,int,float,float,float,float) in net.minecraft.client.renderer.model.Model public static class Modelcustom_model extends EntityModel<Entity> {
^
D:\TEST\src\main\java\net\mcreator\testowe\entity\renderer\PolRenderer.java:47: error: cannot find symbol texWidth = 16;
^
symbol: variable texWidth
location: class net.mcreator.testowe.entity.renderer.PolRenderer.Modelcustom_model
D:\TEST\src\main\java\net\mcreator\testowe\entity\renderer\PolRenderer.java:48: error: cannot find symbol texHeight = 16;
^
symbol: variable texHeight
location: class net.mcreator.testowe.entity.renderer.PolRenderer.Modelcustom_model
D:\TEST\src\main\java\net\mcreator\testowe\entity\renderer\PolRenderer.java:50: error: cannot find symbol bone.setPos(0.0F, 24.0F, 0.0F);
^
symbol: method setPos(float,float,float)
location: variable bone of type net.minecraft.client.renderer.model.ModelRenderer
D:\TEST\src\main\java\net\mcreator\testowe\entity\renderer\PolRenderer.java:51: error: cannot find symbol bone.texOffs(0, 0).addBox(-1.0F, -1.0F, 0.0F, 1.0F, 1.0F, 1.0F, 0.0F, false);
^
symbol: method texOffs(int,int)
location: variable bone of type net.minecraft.client.renderer.model.ModelRenderer
D:\TEST\src\main\java\net\mcreator\testowe\entity\renderer\PolRenderer.java:54: error: method does not override or implement a method from a supertype @Override
^
D:\TEST\src\main\java\net\mcreator\testowe\entity\renderer\PolRenderer.java:59: error: method does not override or implement a method from a supertype @Override
^
D:\TEST\src\main\java\net\mcreator\testowe\entity\renderer\PolRenderer.java:66: error: cannot find symbol modelRenderer.xRot = x;
^
symbol: variable xRot
location: variable modelRenderer of type net.minecraft.client.renderer.model.ModelRenderer
D:\TEST\src\main\java\net\mcreator\testowe\entity\renderer\PolRenderer.java:67: error: cannot find symbol modelRenderer.yRot = y;
^
symbol: variable yRot
location: variable modelRenderer of type net.minecraft.client.renderer.model.ModelRenderer
D:\TEST\src\main\java\net\mcreator\testowe\entity\renderer\PolRenderer.java:68: error: cannot find symbol modelRenderer.zRot = z;
^
symbol: variable zRot
location: variable modelRenderer of type net.minecraft.client.renderer.model.ModelRenderer
10 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:
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* Get more help at https://help.gradle.org
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BUILD FAILED in 2s
1 actionable task: 1 executed
BUILD FAILED
Task completed in 4 seconds