title: Invoke-customs are only supported starting with Android O (--min-api 26)
body: <p>I have added minimum sdk 16 and target sdk is 29 . My android studio version is 3.5.2 . And this issues is coming :
  <strong><em>Invoke-customs are only supported starting with Android O (--min-api 26)</em></strong>
  For this issues I could not find any solution . Please help me out from this issues.</p>