A PHP Error was encountered

Severity: Notice

Message: Undefined index: id

Filename: controllers/Services.php

Line Number: 18

Backtrace:

File: /www/wwwroot/liuxue.com/application/controllers/Services.php
Line: 18
Function: _error_handler

File: /www/wwwroot/liuxue.com/index.php
Line: 315
Function: require_once