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There are not enough hosts available Docker Swarm Creation Cluster error in Magnum

Hello I am recieving the following error in the magnum, when i try to create a cluster of docker swarm

2016-12-13 14:53:27.227 25775 ERROR magnum.conductor.handlers.cluster_conductor [req-5bcf5521-3ebd-40fd-ac71-225c407147b2 admin admin - - -] Cluster error, stack status: CREATE_FAILED, stack_id: 0524c8f4-bdb9-442b-8a82-64d662690a78, reason: Resource CREATE failed: ResourceInError: resources.swarm_masters.resources[0].resources.swarm_master: Went to status ERROR due to "Message: No valid host was found. There are not enough hosts available., Code: 500"

any clues