admin-class.php doesnt work

[Ben-Delphin]

error in line 21 of admin-class.php which is making approve.php not work

Fatal error: Uncaught Error: Call to a member function prepare() on null in C:\inetpub\wwwroot\internet\admin_isp_toolset\includes\classes\admin-class.php:21 Stack trace: #0 C:\inetpub\wwwroot\internet\admin_isp_toolset\approve.php(38): Admins->loginAdmin() #1 {main} thrown in C:\inetpub\wwwroot\internet\admin_isp_toolset\includes\classes\admin-class.php on line 21