Running tests in IntelliJ ClassNotFoundException

I tried many different run configs, but whatever I do I get this exception when running specs2 tests in IntelliJ for scala.

It always fails to find a class that ends with a $ sign. I checked - and there really is no such class file. There's AppControllerIT.class and lots of classes like AppControllerIT$innerFunctionOrclass.clas, but not AppControllerIT$.class

Any ideas?

Thanks!

com.haha.market.api.e2e.controllers.AppControllerIT$

java.lang.ClassNotFoundException: com.haha.market.api.e2e.controllers.AppControllerIT$


STACKTRACE
  java.net.URLClassLoader.findClass(URLClassLoader.java:381)
  java.lang.ClassLoader.loadClass(ClassLoader.java:424)
  sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
  java.lang.ClassLoader.loadClass(ClassLoader.java:357)
  org.specs2.reflect.Classes$$anonfun$loadClassEither$1.apply(Classes.scala:140)
  org.specs2.reflect.Classes$$anonfun$loadClassEither$1.apply(Classes.scala:140)
  org.specs2.control.ActionT$$anonfun$safe$1.apply(ActionT.scala:89)
  org.specs2.control.ActionT$$anonfun$reader$1$$anonfun$apply$6.apply(ActionT.scala:80)
  org.specs2.control.Status$.safe(Status.scala:100)