TroubleShooting|scala.Predef$.refArrayOps([Ljava/lang/Object;)Lscala/collection/mutable/ArrayOps

【TroubleShooting|scala.Predef$.refArrayOps([Ljava/lang/Object; )Lscala/collection/mutable/ArrayOps】将scala-sdk从2.12换为2.11
File -> Project Structure -> Global libraries -> Remove SDK -> Rebuild.

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