I need to do a very simple task for school in Joomla 3.10.3 but it doesn't seem to work correctly. I'm trying to create modules but I can't, it gives me those errors:
Undefined property: Joomla\CMS\Object\CMSObject::$checked_out in C:\xampp\htdocs\Joomla3\administrator\components\com_modules\views\module\view.html.php on line 62
Warning: Undefined property: Joomla\CMS\Object\CMSObject::$position in C:\xampp\htdocs\Joomla3\administrator\components\com_modules\views\module\tmpl\edit_positions.php on line 17
Warning: Undefined property: Joomla\CMS\Object\CMSObject::$position in C:\xampp\htdocs\Joomla3\administrator\components\com_modules\views\module\tmpl\edit_positions.php on line 27
I've tried going into the files, but it looks like gibberish and I don't think I can fix it from there. Maybe it's something with Joomla 3 being older and me having PHP version 8.1.10, dunno.
I think it is almost certainly the template that you are using is not compatible with PHP 8.1. A lot of the older Joomla 3 templates will throw errors. If you can switch to PHP 7.4.x I expect the problems will stop