AWS Import gives error

While importing the new 7.1rc4 image on AWS its returning error:

 "Status": "deleted",
            "StatusMessage": "ClientError: Unknown OS / Missing OS files.",
            "Tags": []

I am following the https://wiki.mikrotik.com/wiki/Manual:CHR_AWS_installation guide available to do this (some aws commands have changed)
Any insights into this ?

cheers

any help on this ???