A PHP Error was encountered

Severity: Notice

Message: Undefined offset: 0

Filename: controllers/seminar.php

Line Number: 23

Fatal error: Uncaught exception 'PHPTAL_Exception' with message 'Trying to read property 'title' from NULL' in /home/toweralc/www/PHPTAL/Context.php:235 Stack trace: #0 /home/toweralc/www/PHPTAL/tmp/tpl_1_1_11e27cdc0157d5b70196e425075f4dddbc.php(56): phptal_path(NULL, 'title') #1 /home/toweralc/www/system/application/libraries/PHPTAL.php(278): tpl_1_1_11e27cdc0157d5b70196e425075f4dddbc(Object(PHPTAL), Object(PHPTAL_Context)) #2 /home/toweralc/www/system/application/libraries/Ptal.php(77): PHPTAL->execute() #3 /home/toweralc/www/system/application/libraries/Ptal.php(98): Ptal->fetch('seminar_view', '/home/toweralc/...', Array, Array) #4 /home/toweralc/www/system/application/controllers/seminar.php(25): Ptal->view('seminar_view', 'seminar_view', Array) #5 [internal function]: Seminar->view('213') #6 /home/toweralc/www/system/codeigniter/CodeIgniter.php(221): call_user_func_array(Array, Array) #7 /home/toweralc/www/index.php(123): require_once('/home/toweralc/...') #8 {main} thrown in /home/toweralc/www/PHPTAL/Context.php on line 235