bcit-ci/CodeIgniter · error · UnexpectedValueException

Session: Configured driver '$driver' was not found. Aborting

Error message

Session: Configured driver '$driver' was not found. Aborting.

What it means

Error "Session: Configured driver '$driver' was not found. Aborting." thrown in bcit-ci/CodeIgniter.

Source

Thrown at system/libraries/Session/Session.php:252

		if ( ! class_exists($class, FALSE) && file_exists($file_path = APPPATH.'libraries/Session/drivers/'.$class.'.php'))
		{
			require_once($file_path);
			if (class_exists($class, FALSE))
			{
				return $class;
			}
		}

		if ( ! class_exists('CI_'.$class, FALSE))
		{
			if (file_exists($file_path = APPPATH.'libraries/Session/drivers/'.$class.'.php') OR file_exists($file_path = BASEPATH.'libraries/Session/drivers/'.$class.'.php'))
			{
				require_once($file_path);
			}

			if ( ! class_exists('CI_'.$class, FALSE) && ! class_exists($class, FALSE))
			{
				throw new UnexpectedValueException("Session: Configured driver '".$driver."' was not found. Aborting.");
			}
		}

		if ( ! class_exists($prefix.$class, FALSE) && file_exists($file_path = APPPATH.'libraries/Session/drivers/'.$prefix.$class.'.php'))
		{
			require_once($file_path);
			if (class_exists($prefix.$class, FALSE))
			{
				return $prefix.$class;
			}

			log_message('debug', 'Session: '.$prefix.$class.".php found but it doesn't declare class ".$prefix.$class.'.');
		}

		return 'CI_'.$class;
	}

	// ------------------------------------------------------------------------

View on GitHub (pinned to 3658d731ea)

When it happens

Trigger: Thrown at system/libraries/Session/Session.php:252 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of bcit-ci/CodeIgniter@3658d731ea (2026-08-17). Data as JSON: /api/errors/3181ed2b65245a17. Report an issue: GitHub.