Missing Controller

Files_Controller could not be found

Additional Information

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

Request Information
controller: files
action: documents
params: 0 => Smoke_Cessation_desktop_reference.pdf
url: url => files/documents/Smoke_Cessation_desktop_reference.pdf