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That plugin is using outdated code.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 headaches unless you flat out fork it and maintain your own branch (which could be a lot of work).

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