In my case, i write a dag file under the dags path. After start the airflow scheduler, it successfully loads the dag file. However, it fialed to load dag file after changing d
Your DAG should be automatically reloaded on the scheduler heartbeat and this will always be done before a DagRun is started.
It can take a while before changes in the DAG are also shown in the web interface, you can manually reload the Dag in the UI by pressing the refresh button in the top right of the Dag view