the boxfile script probably wants the engine payload rather than "payload"
the boxfile script probably wants the engine payload rather than "payload"

nanobox-io/nanobox-docker-build,pagodabox/nanobox-docker-build,nanobox-io/nanobox-docker-build,nanobox-io/nanobox-docker-build,nanobox-io/nanobox-docker-build,pagodabox/nanobox-docker-build