Missing Controller

Application_Controller could not be found

Additional Information

The system searched in the following paths:
- /home/grimsbyp/public_html/application/controllers
- /home/grimsbyp/public_html/core/libs/controllers

Request Information
controller: application
action: webroot
params: 0 => userfiles 1 => noa&nop_SME_20120518.pdf
url: url => userfiles/noa nop_SME_20120518_pdf =>