while installing devstack getting error in provision step
edx.devstack-lilac.master.memcached is up-to-date
edx.devstack-lilac.master.devpi is up-to-date
edx.devstack-lilac.master.discovery is up-to-date
edx.devstack-lilac.master.forum is up-to-date
edx.devstack-lilac.master.lms is up-to-date
++ for app in “${apps[@]}”
++ docker-compose up -d studio
edx.devstack-lilac.master.chrome is up-to-date
edx.devstack-lilac.master.elasticsearch7 is up-to-date
edx.devstack-lilac.master.memcached is up-to-date
edx.devstack-lilac.master.devpi is up-to-date
edx.devstack-lilac.master.firefox is up-to-date
edx.devstack-lilac.master.mysql57 is up-to-date
edx.devstack-lilac.master.mongo is up-to-date
edx.devstack-lilac.master.discovery is up-to-date
edx.devstack-lilac.master.forum is up-to-date
edx.devstack-lilac.master.lms is up-to-date
edx.devstack-lilac.master.studio is up-to-date
++ docker-compose exec -T lms bash -c ‘source /edx/app/edxapp/edxapp_env && cd /edx/app/edxapp/edx-platform && NO_PYTHON_UNINSTALL=1 paver install_prereqs’
Build failed: Unknown task: install_prereqs
make: *** [Makefile:224: dev.provision] Error 1