living entity with custom model doesnt compile

i tried to make an entity im dumb and i dont know how to fix this.

...C:\Users\User\MCreatorWorkspaces\fnaf_security_breach_902141412414802840214\src\main\java\net\mcreator\fnafsecuritybreach\entity\renderer\FreddyRenderer.java:170: error: cannot find symbol this.head.xRot = headPitch / (180F / (float) Math.PI);
^
symbol: variable xRot
location: variable head of type net.minecraft.client.renderer.model.ModelRenderer
C:\Users\User\MCreatorWorkspaces\fnaf_security_breach_902141412414802840214\src\main\java\net\mcreator\fnafsecuritybreach\entity\renderer\FreddyRenderer.java:171: error: cannot find symbol this.legright.xRot = Mth.cos(limbSwing * 1.0F) * 1.0F * limbSwingAmount;
^
symbol: variable xRot
location: variable legright of type net.minecraft.client.renderer.model.ModelRenderer
C:\Users\User\MCreatorWorkspaces\fnaf_security_breach_902141412414802840214\src\main\java\net\mcreator\fnafsecuritybreach\entity\renderer\FreddyRenderer.java:171: error: cannot find symbol this.legright.xRot = Mth.cos(limbSwing * 1.0F) * 1.0F * limbSwingAmount;
^
symbol: variable Mth
location: class net.mcreator.fnafsecuritybreach.entity.renderer.FreddyRenderer.Modelglamfreddy
C:\Users\User\MCreatorWorkspaces\fnaf_security_breach_902141412414802840214\src\main\java\net\mcreator\fnafsecuritybreach\entity\renderer\FreddyRenderer.java:172: error: cannot find symbol this.armleft.xRot = Mth.cos(limbSwing * 0.6662F + (float) Math.PI) * limbSwingAmount;
^
symbol: variable xRot
location: variable armleft of type net.minecraft.client.renderer.model.ModelRenderer
C:\Users\User\MCreatorWorkspaces\fnaf_security_breach_902141412414802840214\src\main\java\net\mcreator\fnafsecuritybreach\entity\renderer\FreddyRenderer.java:172: error: cannot find symbol this.armleft.xRot = Mth.cos(limbSwing * 0.6662F + (float) Math.PI) * limbSwingAmount;
^
symbol: variable Mth
location: class net.mcreator.fnafsecuritybreach.entity.renderer.FreddyRenderer.Modelglamfreddy
C:\Users\User\MCreatorWorkspaces\fnaf_security_breach_902141412414802840214\src\main\java\net\mcreator\fnafsecuritybreach\entity\renderer\FreddyRenderer.java:173: error: cannot find symbol this.legleft.xRot = Mth.cos(limbSwing * 1.0F) * -1.0F * limbSwingAmount;
^
symbol: variable xRot
location: variable legleft of type net.minecraft.client.renderer.model.ModelRenderer
C:\Users\User\MCreatorWorkspaces\fnaf_security_breach_902141412414802840214\src\main\java\net\mcreator\fnafsecuritybreach\entity\renderer\FreddyRenderer.java:173: error: cannot find symbol this.legleft.xRot = Mth.cos(limbSwing * 1.0F) * -1.0F * limbSwingAmount;
^
symbol: variable Mth
location: class net.mcreator.fnafsecuritybreach.entity.renderer.FreddyRenderer.Modelglamfreddy
81 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
BUILD FAILED in 2m 2s
1 actionable task: 1 executed

BUILD FAILED
Task completed in 2 minutes and 12 seconds