Apache Airflow Task instance not found

The task instance might have been deleted or not created due to a DAG run failure.
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What is

Apache Airflow Task instance not found

 ?

['Step 1: Check the DAG run status in the Airflow UI.', "Step 2: Verify if the task instance exists in the database using a query: `SELECT * FROM taskinstance WHERE dagid='id>' AND taskid='id>' AND executiondate='';`.", 'Step 3: Rerun the DAG if the task instance was not created.']

Attached error: 
Apache Airflow Task instance not found
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