Fatal error: Uncaught TypeError: Unsupported operand types: string - int in /var/www/pd/model/classes/data_class.php:35 Stack trace: #0 /var/www/pd/model/classes/data_class.php(167): data_class->get_sub_query() #1 /var/www/pd/model/classes/city_class.php(136): data_class->fetch_all() #2 /var/www/pd/router/blocks/DSTATE.php(10): city_class->fetch_state_based_cities() #3 /var/www/pd/d_state/body.php(13): require('...') #4 /var/www/pd/d_state/index.php(40): require('...') #5 {main} thrown in /var/www/pd/model/classes/data_class.php on line 35