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• The WsAzkabanWeb and WsAzkabanExec services are not running. Go to Services.msc in Windows and check if they are running. if they are not running, right click on a service and select start. Or for Linux, follow the diagnostics process mentioned in the Linux scheduler installation for determining of the services are running.
• The job being run already exists in a Running or Pending state, check the Azkaban running tab to see if any jobs are stuck in Pending, this can happen if there are no Executors running or if there are no Executors with the matching tags of the Job config available. Either start a matching Executor or Cancel the job and republish with a tag that matches an executor. Note: tags are casescase-sensitive.
• "Trigger will never fire" error - this means the job config you specified will never run since the schedule is in the past. Edit the job to adjust the schedule.

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• Check the Azkaban running tab to see if any jobs are stuck in Pending, this can happen if there are no Executors running or if there are no Executors with the matching tags of the Job config available.
• To resolve this, either start a matching Executor or Cancel the job and republish with a tag that matches an executor. 
  • Tags are casescase-sensitive.
  • Default tags given to jobs run from the RED UI are configured in the Scheduler Configuration screen in RED.