The drush command 'provision-save @platform_drupal797' could not be found

Hi all,
I was trying to verify a new drupal-7.97 platform using aegir web interface hosted on ubuntu server and come across the following error.

**The drush command 'provision-save @platform_drupal797' could not be found
Run `drush cache-clear drush` to clear the commandfile cache if you have installed new extensions.**

I successfully cleared the drush cache which doesn't seem to solve the problem.

Any suggestion is appreciated