App Crashes After XCode Update

I have an app where I have a custom cell and contraints. Auto layout is unchecked for the xib file. The error I get is:

Objective-C exception thrown. Name: NSInvalidUnarchiveOperationException Reason: Could not instantiate class named _UITableViewCellSeparatorView

This only happens on pre ios 7 OS and maybe related to 4th gen devices.

Here is the code that generates the error:

    public static ServerCell Create()
    {
        try
        {
            return (ServerCell)Nib.Instantiate(null, null)[0];
        }
        catch(Exception ex)
        {
            Console.WriteLine(ex.Message);
            return null;
        }

    }

Thanks for your help.