<div style="border:1px solid #990000;padding-left:20px;margin:0 0 10px 0;"> <h4>A PHP Error was encountered</h4> <p>Severity: Notice</p> <p>Message: Undefined variable: titulo</p> <p>Filename: views/header.php</p> <p>Line Number: 18</p> <p>Backtrace:</p> <p style="margin-left:10px"> File: /home/caesarc1/public_html/ciencia_unam/application/views/header.php<br /> Line: 18<br /> Function: _error_handler </p> <p style="margin-left:10px"> File: /home/caesarc1/public_html/ciencia_unam/application/controllers/Contenido.php<br /> Line: 225<br /> Function: parse </p> <p style="margin-left:10px"> File: /home/caesarc1/public_html/ciencia_unam/index.php<br /> Line: 315<br /> Function: require