Xcode 6 (beta 3): Unsupported pixel format in CSI or Unable to create unsliced image from csi bitmap data
This is caused by a bug in Xcode 6 (beta 3 at this time). It appears to occur only if your build target is iOS 7.x
To work around this issue:
1) delete the files from the Images.xcassets container.
2) place the images directly into the "Supporting Files" folder.
Note: It is not required to add the ".png" extension within your code, making this a clean workaround.
Please create a RADAR (bug report) to Apple.
Apple engineer's response:
The issue is that iOS 7 apps cannot have JPEG images in the CAR file. actool should have copied the JPEG as a loose image into your app's folder. To work around this issue, you should either convert the image to a PNG or include the JPEG as a resource outside of the asset catalog.