Intellij IDEA 測試scala程序的時候:Exception in thread "main" java.lang.NoClassDefFoundError: scala/Predef$

錯誤信息如下: Exception in thread "main" java.lang.NoClassDefFoundError: scala/Predef$         at HelloWorld$.main(HelloWorld.scala:4)         at HelloWorld.main(HelloWorld.scala) Caused by: java.lang.Class

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