title: how can I resolve this error with letsencrept and nginx?
body: <p>can any one help me with this error ?</p>
  <p>Failed authorization procedure. hi.example.com (http-01): urn:ietf:params:acme:error:unauthorized :: The client lacks sufficient authorization :: 52.90.88.98: Invalid response from <a href="https://hi.example.com/.well-known/acme-challenge/AthDFrwKMLH0rwSyy2-U30plT2JGeka2v9-Fz-Ebvkg" rel="nofollow noreferrer">https://hi.example.com/.well-known/acme-challenge/AthDFrwKMLH0rwSyy2-U30plT2JGeka2v9-Fz-Ebvkg</a>: 404</p>