Entity causing compilation error

Im using Portable Mcreator, version 2021.1.12313.

So, idk whats wrong, i tried create a invisible entity, but doesnt worked. At first I think it was a texture, but when I put one of the minecraft it didn't work anyway.

I left prints of each page of creation of the entity and the code in java.

Visual and Sound | No Sound*

Behavior | Immune to everything*

Particles

Inventory

Triggers

AI and Goals

Spawning

Executing Gradle task: build
Build info: MCreator 2021.1.12313 EAP (12313), forge-1.16.5, 64-bit, 4004 MB, Windows 8.1, JVM 1.8.0_275, JAVA_HOME: C:\Users\Enzo\Desktop\MCreatorEAP20211b12313\jdk
> Task :compileJava FAILED
C:\Users\user\MCreatorWorkspaces\freyjamod\src\main\java\net\mcreator\freyjamod\entity\ChunkBlockEntity.java:132: error: registerAttributes() in CustomEntity cannot override registerAttributes() in LivingEntity protected void registerAttributes() {
^
overridden method is static
C:\Users\user\MCreatorWorkspaces\freyjamod\src\main\java\net\mcreator\freyjamod\entity\ChunkBlockEntity.java:131: error: method does not override or implement a method from a supertype @Override
^
C:\Users\user\MCreatorWorkspaces\freyjamod\src\main\java\net\mcreator\freyjamod\entity\ChunkBlockEntity.java:134: error: cannot find symbol if (this.getAttribute(SharedMonsterAttributes.MOVEMENT_SPEED) != null)
^
symbol: variable SharedMonsterAttributes
location: class CustomEntity
C:\Users\user\MCreatorWorkspaces\freyjamod\src\main\java\net\mcreator\freyjamod\entity\ChunkBlockEntity.java:135: error: cannot find symbol this.getAttribute(SharedMonsterAttributes.MOVEMENT_SPEED).setBaseValue(0);
^
symbol: variable SharedMonsterAttributes
location: class CustomEntity
C:\Users\user\MCreatorWorkspaces\freyjamod\src\main\java\net\mcreator\freyjamod\entity\ChunkBlockEntity.java:136: error: cannot find symbol if (this.getAttribute(SharedMonsterAttributes.MAX_HEALTH) != null)
^
symbol: variable SharedMonsterAttributes
location: class CustomEntity
C:\Users\user\MCreatorWorkspaces\freyjamod\src\main\java\net\mcreator\freyjamod\entity\ChunkBlockEntity.java:137: error: cannot find symbol this.getAttribute(SharedMonsterAttributes.MAX_HEALTH).setBaseValue(1);
^
symbol: variable SharedMonsterAttributes
location: class CustomEntity
C:\Users\user\MCreatorWorkspaces\freyjamod\src\main\java\net\mcreator\freyjamod\entity\ChunkBlockEntity.java:138: error: cannot find symbol if (this.getAttribute(SharedMonsterAttributes.ARMOR) != null)
^
symbol: variable SharedMonsterAttributes
location: class CustomEntity
C:\Users\user\MCreatorWorkspaces\freyjamod\src\main\java\net\mcreator\freyjamod\entity\ChunkBlockEntity.java:139: error: cannot find symbol this.getAttribute(SharedMonsterAttributes.ARMOR).setBaseValue(0);
^
symbol: variable SharedMonsterAttributes
location: class CustomEntity
C:\Users\user\MCreatorWorkspaces\freyjamod\src\main\java\net\mcreator\freyjamod\entity\ChunkBlockEntity.java:140: error: cannot find symbol if (this.getAttribute(SharedMonsterAttributes.ATTACK_DAMAGE) == null)
^
symbol: variable SharedMonsterAttributes
location: class CustomEntity
C:\Users\user\MCreatorWorkspaces\freyjamod\src\main\java\net\mcreator\freyjamod\entity\ChunkBlockEntity.java:141: error: cannot find symbol this.getAttributes().registerAttribute(SharedMonsterAttributes.ATTACK_DAMAGE);
^
symbol: variable SharedMonsterAttributes
location: class CustomEntity
C:\Users\user\MCreatorWorkspaces\freyjamod\src\main\java\net\mcreator\freyjamod\entity\ChunkBlockEntity.java:141: error: cannot find symbol this.getAttributes().registerAttribute(SharedMonsterAttributes.ATTACK_DAMAGE);
^
symbol: method getAttributes()
C:\Users\user\MCreatorWorkspaces\freyjamod\src\main\java\net\mcreator\freyjamod\entity\ChunkBlockEntity.java:142: error: cannot find symbol this.getAttribute(SharedMonsterAttributes.ATTACK_DAMAGE).setBaseValue(0);
^
symbol: variable SharedMonsterAttributes
location: class CustomEntity
C:\Users\user\MCreatorWorkspaces\freyjamod\src\main\java\net\mcreator\freyjamod\entity\ChunkBlockEntity.java:143: error: cannot find symbol if (this.getAttribute(SharedMonsterAttributes.FLYING_SPEED) == null)
^
symbol: variable SharedMonsterAttributes
location: class CustomEntity
C:\Users\user\MCreatorWorkspaces\freyjamod\src\main\java\net\mcreator\freyjamod\entity\ChunkBlockEntity.java:144: error: cannot find symbol this.getAttributes().registerAttribute(SharedMonsterAttributes.FLYING_SPEED);
^
symbol: variable SharedMonsterAttributes
location: class CustomEntity
C:\Users\user\MCreatorWorkspaces\freyjamod\src\main\java\net\mcreator\freyjamod\entity\ChunkBlockEntity.java:144: error: cannot find symbol this.getAttributes().registerAttribute(SharedMonsterAttributes.FLYING_SPEED);
^
symbol: method getAttributes()
C:\Users\user\MCreatorWorkspaces\freyjamod\src\main\java\net\mcreator\freyjamod\entity\ChunkBlockEntity.java:145: error: cannot find symbol this.getAttribute(SharedMonsterAttributes.FLYING_SPEED).setBaseValue(0);
^
symbol: variable SharedMonsterAttributes
location: class CustomEntity
16 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
BUILD FAILED in 4s
1 actionable task: 1 executed
BUILD FAILED
Task completed in 6 secondsExecuting Gradle task: build