A PHP Error was encountered

Severity: Notice

Message: Use of undefined constant TEACHER_SECTION_DONATION - assumed 'TEACHER_SECTION_DONATION'

Filename: models/Teacher_model.php

Line Number: 39

Backtrace:

File: C:\inetpub\wwwroot\dev\application\models\Teacher_model.php
Line: 39
Function: _error_handler

File: C:\inetpub\wwwroot\dev\application\controllers\School.php
Line: 91
Function: get_item

File: C:\inetpub\wwwroot\dev\index.php
Line: 316
Function: require_once