Apache Airflow Task stuck in 'queued' state

The task might be waiting for a worker slot to become available or there might be a configuration issue.
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What is

Apache Airflow Task stuck in 'queued' state

 ?

['Step 1: Check the worker logs for any errors using the command: `tail -f $AIRFLOWHOME/logs/worker/latest/worker.log`.', 'Step 2: Verify the `parallelism`, `dagconcurrency`, and `maxactiverunsperdag` settings in the `airflow.cfg` file.', 'Step 3: Ensure that the Celery or LocalExecutor is running if using those executors.', 'Step 4: Restart the Airflow worker using the command: `airflow celery worker` or `airflow worker`.']

Attached error: 
Apache Airflow Task stuck in 'queued' state
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