Could not load the "" image referenced from a nib

I have no images called "" (nothing). I've gone through the .xib file of the screen where this pops up and can't find anything that would cause this. Anybody who have had the same issue? Here is the full warning:

Could not load the "" image referenced from a nib in the bundle with identifier "com.blah.Blah"

You can do this to check it from your storyboard, or nib. Open it as Source Code:

Then "Find" the image name in it, see if it exists but already invalid in your project, probably you have deleted or changed its name, and now it doesn't seem valid.