Mob Not working (Gecko lib)

i made a mob using the gecko lib plugin, i added an animated entity, i made the model, texture, and animations all in blockbench.

now after i made the mob, i made sure to put something in every single necesarry boxes, and when i launched the game, everything was fine

but when i tried to spawn my mob, the game just crashed, and the report isnt clear enough on what the problem is and just tells me that there is a problem

but not what it is!!!

pls anyone help! if the report is helpful , then here is it after it crashed, and its not letting me in the game anymore because it continously crashes?!?!?!?!?

Executing Gradle task: runClient
Build info: MCreator 2023.3.36712, forge-1.20.1, 64-bit, 16180 MB, Windows 11, JVM 17.0.7, JAVA_HOME: D:\MCreator\jdk, started on: 2023-10-06-20:39:32
 

 Task :compileJava FAILED
\MCreatorWorkspaces\mob_vote_notmeplaying\src\main\java\net\mcreator\mobvotenotmeplaying\entity\BrownBearEntity.java:165: error: cannot find symbol if ((event.isMoving() || !(event.getLimbSwingAmount() > -0.15F && event.getLimbSwingAmount() < 0.15F)) && this.isOnGround() && !this.isVehicle() && !this.isAggressive()) {
^
symbol: method isOnGround()
\MCreatorWorkspaces\mob_vote_notmeplaying\src\main\java\net\mcreator\mobvotenotmeplaying\entity\BrownBearEntity.java:180: error: cannot find symbol if (!this.isOnGround()) {
^
symbol: method isOnGround()
\MCreatorWorkspaces\mob_vote_notmeplaying\src\main\java\net\mcreator\mobvotenotmeplaying\entity\BrownBearEntity.java:200: error: level has private access in Entity this.lastSwing = level.getGameTime();
^
\MCreatorWorkspaces\mob_vote_notmeplaying\src\main\java\net\mcreator\mobvotenotmeplaying\entity\BrownBearEntity.java:202: error: level has private access in Entity if (this.swinging && this.lastSwing + 7L <= level.getGameTime()) {
^
4 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 3s
1 actionable task: 1 executed

BUILD FAILED
Task completed in 6 seconds