Twenty Eleven theme-options error

You will need to login over FTP, or via some file manager supplied by your host (cPanel and Plesk have built in FTP-like file managers), and replace that file with a clean one. After which, don’t use the file editor. It is dangerous, like working on an airplane while it is in the air.

WordPress Error Missing Argument [duplicate]

That plugin is using outdated code. $wpdb->prepare used to allow the second parameter to be omitted, though using prepare without it never really made since. As of 3.5 the second parameter is required. You will need to update the plugin, if there is an update, or hack the plugin yourself which is prone to cause … Read more