( ! ) Fatal error: During inheritance of PDO: Uncaught ArgumentCountError: Too few arguments to function _drupal_error_handler(), 4 passed in /var/www/lrsu.physics.ntua.gr/includes/bootstrap.inc on line 2462 and exactly 5 expected in /var/www/lrsu.physics.ntua.gr/includes/bootstrap.inc:2316 Stack trace: #0 /var/www/lrsu.physics.ntua.gr/includes/bootstrap.inc(2462): _drupal_error_handler(8192, 'Return type of ...', '/var/www/lrsu.p...', 1294) #1 /var/www/lrsu.physics.ntua.gr/includes/bootstrap.inc(2462): require_once() #2 /var/www/lrsu.physics.ntua.gr/includes/bootstrap.inc(2243): _drupal_bootstrap_database() #3 /var/www/lrsu.physics.ntua.gr/includes/bootstrap.inc(2381): drupal_bootstrap(3, false) #4 /var/www/lrsu.physics.ntua.gr/includes/bootstrap.inc(2239): _drupal_bootstrap_page_cache() #5 /var/www/lrsu.physics.ntua.gr/index.php(20): drupal_bootstrap(7) #6 {main} in /var/www/lrsu.physics.ntua.gr/includes/database/database.inc on line 187
Call Stack
#	Time	Memory	Function	Location
1	0.0002	479200	{main}( )	.../index.php:0
2	0.0061	869024	drupal_bootstrap( $phase = 7, $new_phase = ??? )	.../index.php:20
3	0.0071	880856	_drupal_bootstrap_page_cache( )	.../bootstrap.inc:2239
4	0.0075	929080	drupal_bootstrap( $phase = 3, $new_phase = FALSE )	.../bootstrap.inc:2381
5	0.0075	929080	_drupal_bootstrap_database( )	.../bootstrap.inc:2243