Fatal error: Uncaught Error: Call to a member function lists() on null in C:\web\onlyzx.com\controller\hosp\doctor.inc.php:36 Stack trace: #0 C:\web\onlyzx.com\www\hospital\hosp_doctor.php(4): require() #1 {main} thrown in C:\web\onlyzx.com\controller\hosp\doctor.inc.php on line 36