This issue is seen when the device configuration has unsupported configuration configured such as: configuration-database ephemeral or set system archival configuration transfer-on-commit archive-sites configured as below.
set system configuration-database ephemeral instance mist-cmd
OR
set system archival configuration transfer-on-commit archive-sites "scp://[email protected]:/file/path/config"
Due to this SD Cloud cannot get the latest XML configuration from the device.We need to delete above configuration from the device if present to resolve the import issue.