I got this error; all my images were correctly located in the Images.xcassets folder, and it compiled, verified and ran OK on my development system. So I just deleted the bad key from the <project name>-Info.plist file.
Then the upload to the app store went without complaint. YMMV.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…