java.lang.InternalError: Malformed class name

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java.lang.InternalError: Malformed class name
at java.lang.Class.getSimpleName(Class.java:1133)
at scala.Function0$class.apply$mcV$sp(Function0.scala:34)
at scala.runtime.AbstractFunction0.apply$mcV$sp(AbstractFunction0.scala:12)
at scala.App$$anonfun$main$1.apply(App.scala:61)
at scala.App$$anonfun$main$1.apply(App.scala:61)
at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)
at scala.collection.immutable.List.foreach(List.scala:77)
at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:31)
at scala.collection.mutable.ListBuffer.foreach(ListBuffer.scala:45)
at scala.App$class.main(App.scala:61)
at undefined.Test$.main(t5256c.scala:1)
at undefined.Test.main(t5256c.scala)

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