azkaban.executor.ExecutorManagerException: Error fetching active flows

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    azkaban.executor.ExecutorManagerException: Error fetching active flows
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    java.sql.SQLException: Unknown column 'ex.executor_id' in 'on clause'

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    azkaban.executor.ExecutorManagerException: Error fetching active flows
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    Root Cause Analysis

    1. java.sql.SQLException

      Unknown column 'ex.executor_id' in 'on clause' Query: SELECT ex.exec_id exec_id, ex.enc_type enc_type, ex.flow_data flow_data, et.host host, et.port port, ax.update_time axUpdateTime, et.id executorId, et.active executorStatus FROM execution_flows ex INNER JOIN active_executing_flows ax ON ex.exec_id = ax.exec_id INNER JOIN executors et ON ex.executor_id = et.id Parameters: []

      at org.apache.commons.dbutils.AbstractQueryRunner.rethrow()
    2. Apache Commons DbUtils
      QueryRunner.query
      1. org.apache.commons.dbutils.AbstractQueryRunner.rethrow(AbstractQueryRunner.java:363)
      2. org.apache.commons.dbutils.QueryRunner.query(QueryRunner.java:350)
      3. org.apache.commons.dbutils.QueryRunner.query(QueryRunner.java:306)
      3 frames
    3. Azkaban
      AzkabanWebServer.main
      1. azkaban.executor.JdbcExecutorLoader.fetchActiveFlows(JdbcExecutorLoader.java:212)
      2. azkaban.executor.ExecutorManager.loadRunningFlows(ExecutorManager.java:431)
      3. azkaban.executor.ExecutorManager.<init>(ExecutorManager.java:126)
      4. azkaban.webapp.AzkabanWebServer.loadExecutorManager(AzkabanWebServer.java:261)
      5. azkaban.webapp.AzkabanWebServer.<init>(AzkabanWebServer.java:197)
      6. azkaban.webapp.AzkabanWebServer.main(AzkabanWebServer.java:739)
      6 frames