Error 404 while testing a cube

Universal AR A-Frame
#1

After creating and uploading a simple sample A-frame project I get this error whenever I try to scan the QR code.

404 Not Found

Code: NoSuchKey
Message: The specified key does not exist.
Key: mzyid/3876559148954935912/1.0.0/index.html
RequestId: 6PMKB1XVHEG0GC61
HostId: NhZix32+LobVH1smNGiTEr9hk69+9fTsiQd+qhU1jDfUfJxYuclYl1jaOd2c75Du1qcYMDU+x8g=
An Error Occurred While Attempting to Retrieve a Custom Error Document

Code: NoSuchKey
Message: The specified key does not exist.
Key: 404.html

Could anybody help me?

#2

The index.html is in the root folder