Unable to run solutions to problems

I was using the following playground: Reactive Programming with Reactor 3

If I try to run the solution for any problem statement, I get the following:-

Exception in thread “main” java.lang.NoClassDefFoundError: org/junit/runner/notification/RunListener
at com.codingame.codemachine.runner.junit.JUnitTestListRunner.main(JUnitTestListRunner.java:5)
Caused by: java.lang.ClassNotFoundException: org.junit.runner.notification.RunListener
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
… 1 more

Any help would be appreciated.

Chrome Version 84.0.4147.135 (Official Build) (64-bit)

OS: MacOS Catalina 10.15.6

Comment out everything from your script but the minimum to make it runable and just try a simple action, like printing “test” for example.
If there’s an error at this point, open another puzzle and compare the stub with your script, maybe you removed an important part of the stub without noticing it.

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