A PHP Error was encountered

Severity: Notice

Message: Undefined index: cover

Filename: default/grid_read.php

Line Number: 70

Backtrace:

File: D:\phpstudy_pro\WWW\wssp\application\views\default\grid_read.php
Line: 70
Function: _error_handler

File: D:\phpstudy_pro\WWW\wssp\application\views\default\new_base.php
Line: 108
Function: view

File: D:\phpstudy_pro\WWW\wssp\application\core\MY_Controller.php
Line: 389
Function: view

File: D:\phpstudy_pro\WWW\wssp\application\core\MY_Controller.php
Line: 405
Function: display

File: D:\phpstudy_pro\WWW\wssp\application\controllers\Grid.php
Line: 40
Function: template

File: D:\phpstudy_pro\WWW\wssp\index.php
Line: 293
Function: require_once