After I deactivated the NextGenGallery plugin, my site gone down.
This is an error from error log:
WordPress database error Unknown column 'ids' in 'field list' for query SELECT wp_posts.*, wp_p2p.* FROM wp_posts INNER JOIN wp_p2p\n\t\t\t\tLEFT JOIN wp_p2pmeta AS p2pm_order ON (\n\t\t\t\t\twp_p2p.p2...
Which means there are a conflict with posts 2 posts plugin.
But why all my site is broken?
What are we going to do to restore the website functionality? I appreciate any good suggestion from wordpress community and especially from nextgengallery team