If you accidentally copy a UUID and include trailing whitespace in the GUI for that field while creating a HEAT stack in openstack horizon, the error will complain that Create Failed Resource Create Failed: Error: Resource Create Failed: Neutronclientexception: Invalid Input For Network Id. Reason: '49184104-9ceb-46ce-Ace6-36f771fbe4e0 ' Is Not A Valid Uuid. This error is extra difficult to decipher since that is a valid UUID, but the extra space at the end is what is confusing the UUID validator.
Include trailing whitespace in the UUID field when creating a heat stack in horizon.
