Entity Problem in 2021.1

Hello if i create an entity i get an error in 2021.1 full release.

Executing Gradle task: build
Build info: MCreator 2021.1.16710, forge-1.16.5, 64-bit, 7875 MB, Linux, JVM 1.8.0_275, JAVA_HOME: /home/thekralgame/Desktop/MCreator20211/jdk/jre
> Task :compileJava FAILED
/home/thekralgame/MCreatorWorkspaces/testmod/src/main/java/net/mcreator/testmod/entity/SitableEntity.java:97: error: method does not override or implement a method from a supertype @Override
^
/home/thekralgame/MCreatorWorkspaces/testmod/src/main/java/net/mcreator/testmod/entity/SitableEntity.java:101: error: cannot find symbol super.processInteract(sourceentity, hand);
^
symbol: method processInteract(PlayerEntity,Hand)
/home/thekralgame/MCreatorWorkspaces/testmod/src/main/java/net/mcreator/testmod/entity/SitableEntity.java:111: error: registerAttributes() in CustomEntity cannot override registerAttributes() in LivingEntity protected void registerAttributes() {
^
overridden method is static
/home/thekralgame/MCreatorWorkspaces/testmod/src/main/java/net/mcreator/testmod/entity/SitableEntity.java:110: error: method does not override or implement a method from a supertype @Override
^
/home/thekralgame/MCreatorWorkspaces/testmod/src/main/java/net/mcreator/testmod/entity/SitableEntity.java:113: error: cannot find symbol if (this.getAttribute(SharedMonsterAttributes.MOVEMENT_SPEED) != null)
^
symbol: variable SharedMonsterAttributes
location: class CustomEntity
/home/thekralgame/MCreatorWorkspaces/testmod/src/main/java/net/mcreator/testmod/entity/SitableEntity.java:114: error: cannot find symbol this.getAttribute(SharedMonsterAttributes.MOVEMENT_SPEED).setBaseValue(0.3);
^
symbol: variable SharedMonsterAttributes
location: class CustomEntity
/home/thekralgame/MCreatorWorkspaces/testmod/src/main/java/net/mcreator/testmod/entity/SitableEntity.java:115: error: cannot find symbol if (this.getAttribute(SharedMonsterAttributes.MAX_HEALTH) != null)
^
symbol: variable SharedMonsterAttributes
location: class CustomEntity
/home/thekralgame/MCreatorWorkspaces/testmod/src/main/java/net/mcreator/testmod/entity/SitableEntity.java:116: error: cannot find symbol this.getAttribute(SharedMonsterAttributes.MAX_HEALTH).setBaseValue(10);
^
symbol: variable SharedMonsterAttributes
location: class CustomEntity
/home/thekralgame/MCreatorWorkspaces/testmod/src/main/java/net/mcreator/testmod/entity/SitableEntity.java:117: error: cannot find symbol if (this.getAttribute(SharedMonsterAttributes.ARMOR) != null)
^
symbol: variable SharedMonsterAttributes
location: class CustomEntity
/home/thekralgame/MCreatorWorkspaces/testmod/src/main/java/net/mcreator/testmod/entity/SitableEntity.java:118: error: cannot find symbol this.getAttribute(SharedMonsterAttributes.ARMOR).setBaseValue(0);
^
symbol: variable SharedMonsterAttributes
location: class CustomEntity
/home/thekralgame/MCreatorWorkspaces/testmod/src/main/java/net/mcreator/testmod/entity/SitableEntity.java:119: error: cannot find symbol if (this.getAttribute(SharedMonsterAttributes.ATTACK_DAMAGE) == null)
^
symbol: variable SharedMonsterAttributes
location: class CustomEntity
/home/thekralgame/MCreatorWorkspaces/testmod/src/main/java/net/mcreator/testmod/entity/SitableEntity.java:120: error: cannot find symbol this.getAttributes().registerAttribute(SharedMonsterAttributes.ATTACK_DAMAGE);
^
symbol: variable SharedMonsterAttributes
location: class CustomEntity
/home/thekralgame/MCreatorWorkspaces/testmod/src/main/java/net/mcreator/testmod/entity/SitableEntity.java:120: error: cannot find symbol this.getAttributes().registerAttribute(SharedMonsterAttributes.ATTACK_DAMAGE);
^
symbol: method getAttributes()
/home/thekralgame/MCreatorWorkspaces/testmod/src/main/java/net/mcreator/testmod/entity/SitableEntity.java:121: error: cannot find symbol this.getAttribute(SharedMonsterAttributes.ATTACK_DAMAGE).setBaseValue(3);
^
symbol: variable SharedMonsterAttributes
location: class CustomEntity
14 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 9s
1 actionable task: 1 executed
BUILD FAILED
Task completed in 11 seconds