Issue With A Model

I Have A Custome Model But Everytime I Make A Living Entity With It I Get A Error Heres The Build Log

Executing Gradle task: build
Build info: MCreator 2021.1.18117, forge-1.12.2, 64-bit, 8114 MB, Windows 10, JVM 1.8.0_275, JAVA_HOME: C:\Program Files\Pylo\MCreator\jdk
> Configure project :
New Dep: net.minecraftforge:forge:1.12.2-14.23.5.2855_mapped_snapshot_20171003-1.12
> Task :compileJava
C:\Users\Owner.DESKTOP-G1BRGLU\MCreatorWorkspaces\elitesscpsdown\src\main\java\net\mcreator\elitesscpsdown\entity\EntitySCP939B.java:136: error: cannot find symbol public static class Modelscp_939 extends EntityModel<Entity> {
^
symbol: class EntityModel
location: class EntitySCP939B
C:\Users\Owner.DESKTOP-G1BRGLU\MCreatorWorkspaces\elitesscpsdown\src\main\java\net\mcreator\elitesscpsdown\entity\EntitySCP939B.java:226: error: cannot find symbol public void render(MatrixStack matrixStack, IVertexBuilder buffer, int packedLight, int packedOverlay, float red, float green, float blue,
^
symbol: class MatrixStack
location: class Modelscp_939
C:\Users\Owner.DESKTOP-G1BRGLU\MCreatorWorkspaces\elitesscpsdown\src\main\java\net\mcreator\elitesscpsdown\entity\EntitySCP939B.java:226: error: cannot find symbol public void render(MatrixStack matrixStack, IVertexBuilder buffer, int packedLight, int packedOverlay, float red, float green, float blue,
^
symbol: class IVertexBuilder
location: class Modelscp_939
3 errors
> Task :compileJava FAILED
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
Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/4.9/userguide/command_line_interface.html#sec:c…
BUILD FAILED in 3s
1 actionable task: 1 executed
BUILD FAILED
Task completed in 5 seconds