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The main method caused an error.
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java.lang.RuntimeException: Error while creating the data flow plan for the program: Unknown operator or data set type: null	at org.apache.flink.api.java.operators.OperatorTranslation.translate(OperatorTranslation.java:104)	at org.apache.flink.api.java.operators.OperatorTranslation.translateBulkIteration(OperatorTranslation.java:196)	at org.apache.flink.api.java.operators.OperatorTranslation.translate(OperatorTranslation.java:94)	at org.apache.flink.api.java.operators.OperatorTranslation.translateSingleInputOperator(OperatorTranslation.java:124)	at org.apache.flink.api.java.operators.OperatorTranslation.translate(OperatorTranslation.java:88)	at org.apache.flink.api.java.operators.OperatorTranslation.translateSingleInputOperator(OperatorTranslation.java:124)	at org.apache.flink.api.java.operators.OperatorTranslation.translate(OperatorTranslation.java:88)	at org.apache.flink.api.java.operators.OperatorTranslation.translate(OperatorTranslation.java:63)	at org.apache.flink.api.java.operators.OperatorTranslation.translateToPlan(OperatorTranslation.java:51)	at org.apache.flink.api.java.ExecutionEnvironment.createProgramPlan(ExecutionEnvironment.java:1035)	at org.apache.flink.api.java.ExecutionEnvironment.createProgramPlan(ExecutionEnvironment.java:1002)	at org.apache.flink.client.program.ContextEnvironment.execute(ContextEnvironment.java:58)	at org.apache.flink.api.java.ExecutionEnvironment.execute(ExecutionEnvironment.java:896)	at org.apache.flink.python.api.PythonPlanBinder.runPlan(PythonPlanBinder.java:150)	at org.apache.flink.python.api.PythonPlanBinder.main(PythonPlanBinder.java:115)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.apache.flink.client.program.PackagedProgram.callMainMethod(PackagedProgram.java:509)	at org.apache.flink.client.program.PackagedProgram.invokeInteractiveModeForExecution(PackagedProgram.java:403)	at org.apache.flink.client.program.ClusterClient.run(ClusterClient.java:331)	at org.apache.flink.client.CliFrontend.executeProgram(CliFrontend.java:775)	at org.apache.flink.client.CliFrontend.run(CliFrontend.java:251)	at org.apache.flink.client.CliFrontend.parseParameters(CliFrontend.java:1003)	at org.apache.flink.client.CliFrontend.main(CliFrontend.java:1046)