Call to a member function isLogged()

Just upgraded to the new update which went through fine,

however when trying to load the store front i get this error

Fatal error: Call to a member function isLogged() on a non-object

admin/controller/common/header.php on line 69

Any ideas how to fix?

Thanks

I assume you have some old mods installed or you didn't overwrite the old files with the new files

I have the same problem. I am not upgrade any thing, I just install the fresh 1.4.8, it runs very good in localhost BUT when I upload to server it has the same error
Can anybody help please