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Failed to create subnet "" for network: The allocation pool {u'start': u'', u'end': u''} spans beyond the subnet cidr

I am trying to create a private network in openstack I continue to get this error message

I have ran my subnet through an online utility to verify my calculations are correct and everything checks out.

With on a mask I should be able to use the IP pool of: - which is a total of 256 hosts also confirmed via the calculator above. So I am slightly perplexed as to why I am seeing this error