PHP Exception

Uncaught exception 'Exception' with message 'FATAL ERROR #'2 with message 'Undefined array key 1' File: /var/www/vhosts/oens.nl/httpdocs/Framework2.0/libraries/Router.php, line 60 '
File: /var/www/vhosts/oens.nl/httpdocs/functions.php, line 543
Trace

0. /var/www/vhosts/oens.nl/httpdocs/Framework2.0/libraries/Router.php(60): error_handler()
1. /var/www/vhosts/oens.nl/httpdocs/index.php(139): Router::route()
2. {main}