title: Apache Airflow problem - "a task with task_id create_tag_template_field_result is already in the DAG"
body: <p>So, I have a problem with even the blank Airflow installation.</p>
  <p>As soon as I try to run</p>
  <pre><code>airflow test tutorial print_date 2015-06-01
  </code></pre>
  <p>I get a raised exception which says</p>
  <p><strong>PendingDeprecationWarning: The requested task could not be added to the DAG because a task with task_id create_tag_template_field_result is already in the DAG. Starting in Airflow 2.0, trying to overwrite a task will raise an exception.</strong></p>
  <p>What is the reason for this (as I made literally no changes to the installation whatsoever)?</p>
  <p>I also got that when, in a previous installation, I tried to run my own dag... but the &quot;create_tag_template_field_result&quot; was nowhere to be found in my code.</p>