how do i completely delete a custom mob

Executing Gradle task: runClient
Build info: MCreator 2025.1.10519, neoforge-1.21.4, 64-bit, 7564 MB, Windows 11, JVM 21.0.5, JAVA_HOME: C:\Program Files\Pylo\MCreator\jdk, started on: 2025-05-31-12:56:34

Reusing configuration cache.
> Task :writeClientLegacyClasspath UP-TO-DATE
> Task :createMinecraftArtifacts UP-TO-DATE
> Task :downloadAssets UP-TO-DATE
> Task :processResources UP-TO-DATE
> Task :prepareClientRun UP-TO-DATE
> Task :compileJava
error: cannot find symbol BabyCalypteannaaEntity retval = AviansModEntities.BABY_CALYPTEANNAA.get().create(serverWorld, EntitySpawnReason.BREEDING);
^
symbol: variable BABY_CALYPTEANNAA
location: class AviansModEntities
error: cannot find symbol event.register(AviansModEntities.BABY_CALYPTEANNAA.get(), SpawnPlacementTypes.ON_GROUND, Heightmap.Types.MOTION_BLOCKING_NO_LEAVES,
^
symbol: variable BABY_CALYPTEANNAA
location: class AviansModEntities
2 errors
> Task :compileJava FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':compileJava'.
> Compilation failed; see the compiler output below.
: error: cannot find symbol BabyCalypteannaaEntity retval = AviansModEntities.BABY_CALYPTEANNAA.get().create(serverWorld, EntitySpawnReason.BREEDING);
^
symbol: variable BABY_CALYPTEANNAA
location: class AviansModEntities
: error: cannot find symbol event.register(AviansModEntities.BABY_CALYPTEANNAA.get(), SpawnPlacementTypes.ON_GROUND, Heightmap.Types.MOTION_BLOCKING_NO_LEAVES,
^
symbol: variable BABY_CALYPTEANNAA
location: class AviansModEntities
Note: Recompile with -Xlint:unchecked for details.
2 errors
* Try:
> Check your code and dependencies to fix the compilation error(s)
> Run with --scan to get full insights.
BUILD FAILED in 4s
6 actionable tasks: 1 executed, 5 up-to-date
Configuration cache entry reused.

BUILD FAILED
Task completed in 4 seconds

i deleted a entity and it still doesnt let the mod tester thingy run 

please help