Canon LBP7780CX User Manual page 786

If the shutdown process for the printer starts while an application is being installed, an error message may be displayed
on the [Install] page for SMS, and the installation cancelled. If this happens, install the application again after restarting
the printer by turning the main power switch OFF and then back ON again.
6
After the install is completed, click [To MEAP Application Management].
NOTE
When using the installed application
Start the application.
"Starting MEAP Applications"