AnsibleUndefinedVariable: 'EDXAPP_EDXAPP_SECRET_KEY' is undefined

I’m having this error when setting up Open edX to run my forked repo of edx-platform. When I update the platform using sudo /edx/bin/update edx-platform master, this happens:
TASK [edxapp : create application and auth config]


ok: [localhost] => (item=[u’lms’, u’env’])
failed: [localhost] (item=[u’lms’, u’auth’]) => {“changed”: false, “item”: [“lms”, “auth”], “msg”: “AnsibleUndefinedVariable: ‘EDXAPP_EDXAPP_SECRET_KEY’ is undefined”}
ok: [localhost] => (item=[u’cms’, u’env’])
failed: [localhost] (item=[u’cms’, u’auth’]) => {“changed”: false, “item”: [“cms”, “auth”], “msg”: “AnsibleUndefinedVariable: ‘EDXAPP_EDXAPP_SECRET_KEY’ is undefined”}
to retry, use: --limit @/edx/app/edx_ansible/edx_ansible/playbooks/edxapp.retry

PLAY RECAP ********************************************************************************************************************************************************************************************
localhost : ok=128 changed=32 unreachable=0 failed=1

When first installing the default Native version, I have generated the password files. Do I need to generate the passwords again and where should I put the file? Can somebody help me out with this? Thanks