?
Ah, yes... definitely a bug. Seems to be related to some unanticipated changes in the latest WMF preview, but easy for us to fix. Can you please try upgrading to v1.0.3?
Also please note that, due to a bug in the latest WMF5, it now appears you may need to specify a module name for some non-built in resources; it's supposed to be optional, and search all installed modules if not specified. We don't know when Microsoft will fix this, but the work-around is fairly simple:
PSDsc xWebAdministration::xWebAppPool (
Name: AccountsAppPool,
Ensure: present
);