I keep on having this error below whilw trying to test the web application template described in the [OpenStack Workload Reference Architecture: Web Applications] (https://www.openstack.org/software/sa...).

ERROR: Error parsing template: while parsing a block mapping
in "<unicode string>", line 16, column 3:
  public_network_id:
   ^
expected <block end>, but found '<block mapping start>'
 in "<unicode string>", line 22, column 4:
 default:  a978818b-c2fa-424d-b26 ...
 ^

I have tried to correct it without any progress, is there some standard way for resolving this ?