Trying to create a VM and specify the private IP address in the heat template using fixed_ips tag getting the following error

ERROR: Property error: : resources.my_instance.properties.networks[0].fixed_ip: : "192.168.10.105" does not validate ip_addr (constraint not found)

--tried switching the type from string to ip_addr with no success --tried setting the constraints manually, also no success

Any suggestions?