Troubleshooting
Q: I am getting the following error:
Joomla\CMS\Form\Form::validateField() rule `CssIdentifier` missing
A: This is an error when installing the Joomla 4 compatible module in a Joomla 3 website.
For Joomla 3, download and install version 6.0.12.
When the time comes to upgrade to Joomla 4, download and install version 7.0.4.