title: pangres python: IndexError: All index levels must be named
body: <p>I would like to do an upsert in my sql database using &quot;pangres&quot;,
  however it returns this error</p>
  <pre><code>raise IndexError(&quot;All index levels must be named!&quot;)
  IndexError: All index levels must be named!
  </code></pre>
  <p>what should I do?</p>
  <pre><code>df = pd.read_excel('personne.xlsx')
  upsert(engine=engine,
         df=df,
         table_name='personne',
         if_row_exists='update')
  </code></pre>