When I run a single class of scala with Spark in IDEA, an error happens: java.lang.NoClassDefFoundError: org/apache/spark/SparkContextat java.lang.Class.getDeclaredMethods0(Native Method)at java.lang.Class.privateGetDeclaredMethods(Class.java:2701)at java.lang.Class.privateGetMethodRecursive(Class.java:3048)at java.lang.Class.getMethod0(Class.java:3018)at java.lang.Class.getMethod(Class.java:1784)at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544)at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526)Caused by: java.lang.ClassNotFoundException: org.apache.spark.SparkContextat java.net.URLClassLoader.findClass(URLClassLoader.java:382)at java.lang.ClassLoader.loadClass(ClassLoader.java:424)at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)at java.lang.ClassLoader.loadClass(ClassLoader.java:357)… 7 moreError: A JNI error has occurred, please check your installation and try againException in thread “main”Process finished with exit code 1 Open…