java.lang.NoClassDefFoundError: org/apache/flink/api/common/functions/FlatMapFunction

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java.lang.ClassNotFoundException: org.apache.flink.api.common.functions.FlatMapFunction
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)

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