I also got this error. I will describe my scenario:
I have a subdirectory "img" in which there are several png. One of these png is "ic_timeprogress_000.png"
In the storyboard (visual designer), I had an ImageView, and the image was set to "ic_timeprogress_000.png" (not programmatically). The designer correctly displayed the View image:

Although the error was reset when starting the application.
So, in the storyboard, I changed (I insist: not programmatically) from "ic_timeprogress_000.png" to "img / ic_timeprogress_000.png", which leads to incorrect display of the image in the designer, but displayed correctly at startup (without errors)

Although I modify imageView.image programmatically, this "initial image" is never used.
sports Jun 04 '15 at 16:38 2015-06-04 16:38
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