I cloned a project and I ran
git checkout -b develop
git flow feature start feature_name
Fatal: Not a gitflow-enabled repo yet. Please run 'git flow init' first.
You have to init the git flow on your local repo.
GitFlow are local scripts on your machine and each repository has to have teh metadata (in the config) to use it.
simply run :
# launch the git flow wizard git flow init # Use git flow with default values git flow -d
And you are set to go.