scala.collection.generic.Addable: This exception has no message.

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scala.collection.generic.Addable: 	at org.scalatest.FunSuite$class.test(FunSuite.scala:1039)	at samples.ListSuite.test(scalatest.scala:59)	at samples.ListSuite.(scalatest.scala:61)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)	at java.lang.reflect.Constructor.newInstance(Constructor.java:525)	at java.lang.Class.newInstance0(Class.java:372)	at java.lang.Class.newInstance(Class.java:325)	at org.scalatest.junit.JUnitRunner.(JUnitRunner.scala:62)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)	at java.lang.reflect.Constructor.newInstance(Constructor.java:525)	at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:31)	at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:24)	at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)	at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:29)	at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)	at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:24)	at org.apache.maven.surefire.junit4.JUnit4TestSet.execute(JUnit4TestSet.java:51)	at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.executeTestSet(AbstractDirectoryTestSuite.java:120)	at org.apache.maven.surefire.suite.AbstractDirectoryTestSuite.execute(AbstractDirectoryTestSuite.java:103)	at org.apache.maven.surefire.Surefire.run(Surefire.java:169)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:601)	at org.apache.maven.surefire.booter.SurefireBooter.runSuitesInProcess(SurefireBooter.java:350)	at org.apache.maven.surefire.booter.SurefireBooter.main(SurefireBooter.java:1021)