Upon enabling both the system plugins for Formea and RegularLabs extensions, the front end of the form throws an error:
Too few arguments to function RegularLabs\Library\SystemPlugin::onContentPrepare(), 2 passed in [ROOT]/libraries/src/Plugin/CMSPlugin.php on line 289 and at least 3 expected. 

Disabling either one of them resolve the error and display the form.

Installation environment:
PHP 8.1
Joomla! 4.2
Formea 1.1.1
RegularLabs Library 23.12.16110

 

This issue has been resolved in the released version 1.1.2
Please update your Formea to the latest version