ephraimbuddy commented on issue #18114:
URL: https://github.com/apache/airflow/issues/18114#issuecomment-918090551


   I will be taking a look. Just got a slightly different error from it now in 
main:
   
   ```log
   [2021-09-13 11:06:29,061] {dagbag.py:205} WARNING - Serialized DAG 
employees_etl no longer exists
   [2021-09-13 11:06:29,061] {scheduler_job.py:942} ERROR - Couldn't find dag 
employees_etl in DagBag/DB!
   [2021-09-13 11:06:29,111] {scheduler_job.py:584} ERROR - Exception when 
executing SchedulerJob._run_scheduler_loop
   Traceback (most recent call last):
     File "/opt/airflow/airflow/jobs/scheduler_job.py", line 568, in _execute
       self._run_scheduler_loop()
     File "/opt/airflow/airflow/jobs/scheduler_job.py", line 649, in 
_run_scheduler_loop
       num_queued_tis = self._do_scheduling(session)
     File "/opt/airflow/airflow/jobs/scheduler_job.py", line 749, in 
_do_scheduling
       self._send_dag_callbacks_to_processor(dag_run, callback_to_run)
     File "/opt/airflow/airflow/jobs/scheduler_job.py", line 1014, in 
_send_dag_callbacks_to_processor
       dag = dag_run.get_dag()
     File "/opt/airflow/airflow/models/dagrun.py", line 395, in get_dag
       raise AirflowException(f"The DAG (.dag) for {self} needs to be set")
   airflow.exceptions.AirflowException: The DAG (.dag) for <DagRun 
employees_etl @ 2021-07-12 16:00:00+00:00: 
scheduled__2021-07-12T16:00:00+00:00, externally triggered: False> needs to be 
set
   [2021-09-13 11:06:30,124] {process_utils.py:100} INFO - Sending 
Signals.SIGTERM to GPID 4174
   [2021-09-13 11:06:30,257] {process_utils.py:66} INFO - Process 
psutil.Process(pid=4174, status='terminated', exitcode=0, started='11:01:25') 
(4174) terminated with exit code 0
   [2021-09-13 11:06:30,257] {scheduler_job.py:595} INFO - Exited execute loop
   Traceback (most recent call last):
     File "/usr/local/bin/airflow", line 33, in <module>
       sys.exit(load_entry_point('apache-airflow', 'console_scripts', 
'airflow')())
     File "/opt/airflow/airflow/__main__.py", line 40, in main
       args.func(args)
     File "/opt/airflow/airflow/cli/cli_parser.py", line 48, in command
       return func(*args, **kwargs)
     File "/opt/airflow/airflow/utils/cli.py", line 92, in wrapper
       return f(*args, **kwargs)
     File "/opt/airflow/airflow/cli/commands/scheduler_command.py", line 70, in 
scheduler
       job.run()
     File "/opt/airflow/airflow/jobs/base_job.py", line 245, in run
       self._execute()
     File "/opt/airflow/airflow/jobs/scheduler_job.py", line 568, in _execute
       self._run_scheduler_loop()
     File "/opt/airflow/airflow/jobs/scheduler_job.py", line 649, in 
_run_scheduler_loop
       num_queued_tis = self._do_scheduling(session)
     File "/opt/airflow/airflow/jobs/scheduler_job.py", line 749, in 
_do_scheduling
       self._send_dag_callbacks_to_processor(dag_run, callback_to_run)
     File "/opt/airflow/airflow/jobs/scheduler_job.py", line 1014, in 
_send_dag_callbacks_to_processor
       dag = dag_run.get_dag()
     File "/opt/airflow/airflow/models/dagrun.py", line 395, in get_dag
       raise AirflowException(f"The DAG (.dag) for {self} needs to be set")
   airflow.exceptions.AirflowException: The DAG (.dag) for <DagRun 
employees_etl @ 2021-07-12 16:00:00+00:00: 
scheduled__2021-07-12T16:00:00+00:00, externally triggered: False> needs to be 
set
   ```
   


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