I am concerned about this error, but have no idea what to do about it. Any help will be appreciated. Thank you.
That means that the manifest link doesn’t go anywhere anymore, it might be that the module has moved over to another platform, or has been removed, I would need to know which module it is before checking 
Thank you! I suspect it is the VTTA module. It shows in my update list, but there isn’t a version associated with it. It is a shame this mod is not supported any longer.