Ironwood.master LMS not starting

Tring to do distributed deployment of ironwood.master. LMS is not starting i.e. page is not loading. The supervisor keeps restarting in less than 1 min. The message in the logs edx.log in /edx/var/log/lms/ is as follows:
Could not import Registry from third_party_auth.provider
[service_variant=lms][enterprise.utils][env:sandbox] WARNING [] - cannot import name _LTI_BACKENDS

CMS landing page is loading. LMS and CMS are hosted on the same machine. Celery is hosted on another machine and the supervisor is up and running. But the above mentioned warning keeps recurring in edx.log in /edx/var/log/lms & /edx/var/log/cms of the celery machine too. Please help.