Oh, sorry again. It's not even on github. I was mistaken. Probably I confused the github repo with this tuto as I was looking at both. Anyway, I took the parameter_groups from it not from github. Next time i'll pay more attention to what I say.

You were right, once I removed the parameter_groups and corrected some parameters. My template was parsed correctly without errors.

2015-05-13 10:31 GMT+02:00 Steven Hardy <shardy@redhat.com>:
On Wed, May 13, 2015 at 10:20:30AM +0200, ICHIBA Sara wrote:
>    Ok, thank you for your response. I'll change it and see what it gives me.
>    I followed some template examples which I found in github. I'm just
>    running some tests to get used to heat and its templates

Where on github?  If it's an official repo we should fix it.

I've raised an upstream bug[1] so we can improve the error message, and
possibly the user-guide documentation[2] and official heat example
templates[3]

Parameter groups are documented in the HOT spec[4], but it seems like we
can improve things elsewhere.

[1] https://bugs.launchpad.net/heat/+bug/1454559
[2] http://docs.openstack.org/user-guide/enduser/hot-guide/hot_hello_world.html#input-parameters
[3] https://github.com/openstack/heat-templates
[4] http://docs.openstack.org/developer/heat/template_guide/hot_spec.html#parameter-groups-section