You're likely on an old version of Foolcat, update to the latest version.
"Invalid activation number"
You're likely trying to activate Foolcat using a legacy license key. Legacy license keys start with id or only have a few characters. Upgrade your license, or download a legacy version.
Foolcat states "Starting Services"
Foolcat's media engine isn't starting properly. Reboot your computer, and if that doesn't help, reinstall Foolcat.