I need help with uploading custom model for a mob

I am trying to use a custom model I made on Blockbench for a mob. I export it as a Java Entity, and I did everything exactly how I was told it should be. Project, identifier and texture names are the same "portal_skeleton", it is 1.15-1.16 MCP (I am using mcreator 1.15.2 2020.5) but I am still getting an error message. PLEASE HELP

> 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/4.10.3/userguide/command_line_interface.html#se…
BUILD FAILED in 47s
1 actionable task: 1 executed
BUILD FAILED

It also gives me an error for I THINK the cubes from Blockbench.

cube_r1 = new ModelRenderer(this);
^
symbol: variable cube_r1
location: class Modelportal_skeleton
C:\Users\NikExterri\MCreatorWorkspaces\super_epic_mod_bro_wtf_omg_lmfao\src\main\java\net\mcreator\superepicmodbrowtfomglmfao\entity\PortalSkeletonEntity.java:359: error: cannot find symbol cube_r1.setRotationPoint(1.0822F, -4.8815F, 0.0F);
^
symbol: variable cube_r1
location: class Modelportal_skeleton
C:\Users\NikExterri\MCreatorWorkspaces\super_epic_mod_bro_wtf_omg_lmfao\src\main\java\net\mcreator\superepicmodbrowtfomglmfao\entity\PortalSkeletonEntity.java:360: error: cannot find symbol leg1.addChild(cube_r1);
^
symbol: variable cube_r1
location: class Modelportal_skeleton
C:\Users\NikExterri\MCreatorWorkspaces\super_epic_mod_bro_wtf_omg_lmfao\src\main\java\net\mcreator\superepicmodbrowtfomglmfao\entity\PortalSkeletonEntity.java:361: error: cannot find symbol setRotationAngle(cube_r1, 0.0F, 0.0F, -0.2618F);\

I require severe assistance.