I'm running WP Multisite and i use a theme for the main

Hello,

I'm running WP Multisite and i use a theme for the main site and for 10 of sub sites. And everything is working fine until today the Main Site only appears a strange error after i clicked on portolio item (http://domain.com/portfolio_item/123/)

404 - Page Not Found
The page you are trying to access does not exist!

And (http://subsite1.domain.com/portfolio_item/123/) is working fine

i deactivated all the plugins from main site and network plugins but still no luck