Why I'm getting error ( no such table: task_instance) when running from pycharm?

Question

I created a simple DAG:

with DAG(dag_id='a_example_pycharm', schedule_interval=None, start_date=days_ago(2),) as dag:

    def task1_func(ti):
        print('task1: print from task 1')

    def task2_func(ti):
        print('task2: print from task 2')


    task1 = PythonOperator(task_id='task1',  python_callable=task1_func, provide_context=True)
    task2 = PythonOperator(task_id='task2',  python_callable=task2_func, provide_context=True)

task1 >> task2


if __name__ == "__main__":

    from airflow.utils.state import State
    dag.clear(dag_run_state=State.NONE)
    dag.run()

• I can run this DAG from airflow webserver

My pycharm project look:

I'm trying to run this DAG from pycharm and getting error:

sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) no such table: task_instance
[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.run_id AS task_instance_run_id, 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.queued_by_job_id AS task_instance_queued_by_job_id, task_instance.pid AS task_instance_pid, task_instance.executor_config AS task_instance_executor_config, task_instance.external_executor_id AS task_instance_external_executor_id, task_instance.trigger_id AS task_instance_trigger_id, task_instance.trigger_timeout AS task_instance_trigger_timeout, task_instance.next_method AS task_instance_next_method, task_instance.next_kwargs AS task_instance_next_kwargs, dag_run_1.state AS dag_run_1_state, dag_run_1.id AS dag_run_1_id, dag_run_1.dag_id AS dag_run_1_dag_id, dag_run_1.queued_at AS dag_run_1_queued_at, dag_run_1.execution_date AS dag_run_1_execution_date, dag_run_1.start_date AS dag_run_1_start_date, dag_run_1.end_date AS dag_run_1_end_date, dag_run_1.run_id AS dag_run_1_run_id, dag_run_1.creating_job_id AS dag_run_1_creating_job_id, dag_run_1.external_trigger AS dag_run_1_external_trigger, dag_run_1.run_type AS dag_run_1_run_type, dag_run_1.conf AS dag_run_1_conf, dag_run_1.data_interval_start AS dag_run_1_data_interval_start, dag_run_1.data_interval_end AS dag_run_1_data_interval_end, dag_run_1.last_scheduling_decision AS dag_run_1_last_scheduling_decision, dag_run_1.dag_hash AS dag_run_1_dag_hash 
FROM task_instance JOIN dag_run ON dag_run.dag_id = task_instance.dag_id AND dag_run.run_id = task_instance.run_id JOIN dag_run AS dag_run_1 ON dag_run_1.dag_id = task_instance.dag_id AND dag_run_1.run_id = task_instance.run_id 
WHERE task_instance.dag_id = ? AND task_instance.task_id IN (?, ?) AND dag_run.execution_date <= ? AND task_instance.operator = ?]
[parameters: ('a_example_pycharm', 'task1', 'task2', '2022-02-12 19:21:43.892837', 'ExternalTaskMarker')]
(Background on this error at: https://sqlalche.me/e/14/e3q8)

1. What is wrong ?
2. How can I run this DAG from pycharm project ?