Airflow: Airflow scheduler not starting

[rishabhgarg7]

When I'm doing airflow scheduler on my local machine, it's giving the following SQLAlchemy error:

File "/home/ubuntu/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 590, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) no such column: task_instance.pool_slots
[SQL: SELECT task_instance.try_number AS task_instance_try_number, task_instance.task_id AS task_instance_task_id, task_instance.dag_id AS task_instance_dag_id, task_instance.execution_date AS task_instance_execution_date, task_instance.start_date AS task_instance_start_date, task_instance.end_date AS task_instance_end_date, task_instance.duration AS task_instance_duration, task_instance.state AS task_instance_state, task_instance.max_tries AS task_instance_max_tries, task_instance.hostname AS task_instance_hostname, task_instance.unixname AS task_instance_unixname, task_instance.job_id AS task_instance_job_id, task_instance.pool AS task_instance_pool, task_instance.pool_slots AS task_instance_pool_slots, task_instance.queue AS task_instance_queue, task_instance.priority_weight AS task_instance_priority_weight, task_instance.operator AS task_instance_operator, task_instance.queued_dttm AS task_instance_queued_dttm, task_instance.pid AS task_instance_pid, task_instance.executor_config AS task_instance_executor_config
FROM task_instance JOIN dag_run ON task_instance.dag_id = dag_run.dag_id AND task_instance.execution_date = dag_run.execution_date
WHERE dag_run.state = ? AND dag_run.run_id NOT LIKE ? AND task_instance.state IN (?, ?)]
[parameters: ('running', 'backfill_%', 'scheduled', 'queued')]

[boring-cyborg[bot]]

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[ephraimbuddy]

Have you tried initializing the db or resetting it? airflow db init or airflow db reset