Plug is needed to display this content: Adobe Flash Player Installer

Hello buddies,
I am running Ubuntu 11.10. And the Mozilla Firefox error shows "A plug in is needed to display this content: Adobe Flash Player Installer" So then I install it, it displays "Installed – restart Fire Fox" after that I restart Fire fox but the same error message again pops up.
I don’t found it with Windows 7 (IE, Chrome & Fire fox are fine) or with previous version of Ubuntu. Problem starts when I try to access CallOfRoma.com. Need help.
Thanks.
