session_start(): open(/opt/alt/php81/var/lib/php/session/sess_m8n2n4g421dsebbif1rurnsckg, O_RDWR) failed: Permission denied (13)(2) (500)

At /var/www/vhosts/bradspreadsheet.net/httpsdocs/pc5-mvc-core/inc-action-handler.php, line 157

An unrecoverable error occurred while processing this page - here's where:

			$controller->OnSessionStarting();

		}

		//RedirectToAction calls this twice

		@session_start();

		ob_start();

		if( is_callable( array($controller, "OnSessionStarted")) )

		{

And here's a backtrace:

• ErrorHandler() (callback)
• session_start() in /var/www/vhosts/bradspreadsheet.net/httpsdocs/pc5-mvc-core/inc-action-handler.php:157
• LoadAction() in /var/www/vhosts/bradspreadsheet.net/httpsdocs/index.php:18

PC5 MVC, this stops here.