Unable to start devstack. Fails at the provisioning command

I’m guessing that you did not use the OPENEDX_RELEASE environment variable, and therefore all of your repos (except for devstack) have the master branch checked out rather than Olive master. See the instructions at the top of Developing on Open edX named release branches — Open edX Devstack Unversioned documentation

(I’m not sure how this would produce the precise error you’re seeing, it’s just my guess.)