Hello does anybody know how to stop this error? If you need me to provide any more information, please ask. Thank you

systemctl status [email protected]:acpi_video0.service
ā— [email protected]:acpi_video0.service - Load/Save Screen Backlight Brightness of backlight:acpi_video0
Loaded: loaded (/usr/lib/systemd/system/[email protected]; static; vendor preset: disabled)
Active: failed (Result: exit-code) since Sun 2015-02-22 21:40:06 GMT; 3min 39s ago
Docs: man:[email protected](8)
Process: 299 ExecStart=/usr/lib/systemd/systemd-backlight load %i (code=exited, status=1/FAILURE)
Main PID: 299 (code=exited, status=1/FAILURE)