JunitRunner not found

I have been learning MXNet in scala , I tried to install in multiple ways finally I followed the installation for IntelliJ Mac , after following the instructions
I get the following error when I run the APP
JunitRunner not found

Does it happen in the file specs.scala? If so, just add import to the top of the file

import org.scalatest.junit.JUnitRunner

At least in my case it helped.