'Converts a project id to an application id.
Args:
project_id: The project id.
Returns:
The application id.
Raises:
InvalidConversionError: if the application is unknown for the project id.'

def resolve_app_id(self, project_id):

    check_conversion((project_id in self._resolver_map), ('Cannot    determine    application    id    for    provided    project    id:    "%s".' % project_id))
    return self._resolver_map[project_id]
