Seems the deploy SSH key wasn't added to private repositories we manage:
---------- ID: staging_private_repository Function: git.latest Name: ssh://vcs@devcentral.nasqueron.org:5022/source/private-staging.git Result: False Comment: Failed to update submodules: Unable to authenticate using identity file: Submodule 'wwwroot/dereckson.be/watai' (git@bitbucket.org:dereckson/watai.dereckson.be.git) registered for path 'wwwroot/dereckson.be/watai'