I’m trying to extend a calendar view in Odoo 16, specifically the “popover”. I’ve followed various steps and guides, but I keep encountering the following error:

odoo.tools.convert.ParseError: while parsing None:3, somewhere inside.

I can’t figure out what I’m doing wrong. Can anyone help me?

Thank you very much!

# Module structure
my_module/
├── __init__.py
├── __manifest__.py
└── views/
    └── attendee_calendar_common_popover_extension.xml

# __manifest__.py
{
    'name': 'My Module',
    'version': '1.0',
    'summary': 'Estende la vista del calendario per aggiungere più campi',
    'category': 'Calendar',
    'depends': ['calendar'],
    'data': [
        'views/attendee_calendar_common_popover_extension.xml',
    ],
    'installable': True,
    'application': False,
}

Parent View
https://github.com/odoo/odoo/blob/16.0/addons/calendar/static/src/views/attendee_calendar/common/attendee_calendar_common_popover.xml