A PHP Error was encountered

Severity: Notice

Message: Undefined index: mobile

Filename: libraries/Moblie_library.php

Line Number: 51

Backtrace:

File: D:\xampp\www\xingfaV2\application\libraries\Moblie_library.php
Line: 51
Function: _error_handler

File: D:\xampp\www\xingfaV2\application\controllers\Join.php
Line: 98
Function: checkmobile

File: D:\xampp\www\xingfaV2\index.php
Line: 315
Function: require_once