I don't see your picture but thats because application can't find 'TImagingPNG' class which stored that data.
I suspect the problem is in next:
You are using some package in the IDE which registers TImagingPNG class for .png image format. Thus in design-time you IDE which built with TImagingPNG can load your picture. But your application does not include TImagingPNG class and therefore can't load stored data.
Solution:
a) remove package with TImagingPNG class from IDE and rebuild it after
b) add unit which registers TImagingPNG as a graphic format to your uses section.