我在images.xcassets中有几个资源，它们都是设备的矢量＆＃34; Universal＆＃34;组态。它运作得很好。
但是，当我将其中一个更改为设备＆＃34;特定＆＃34;为了为iPad指定不同的资源，该项目不再编译。
导致此问题的是唯一的唯一更改，此外，错误最多也是通用的：
2015-02-03 10:28:32.225 ibtoold[14561:217936] [MT] DVTAssertions: ASSERTION FAILURE in /SourceCache/DVTFrameworks/DVTFrameworks-6608/DVTKit/CocoaClassCategories/DVTNSImageAdditions.m:305
Details: Assertion failed: [scaleFactor doubleValue] > 0.0
Object: <NSImage>
Method: +dvt_imageWithSize:scaleFactors:flipped:forRenderingIntoContext:fromCommands:
Thread: <NSThread: 0x7fa813d29420>{number = 1, name = main}
Hints: None
Backtrace:
0 0x000000011006124a -[DVTAssertionHandler handleFailureInMethod:object:fileName:lineNumber:assertionSignature:messageFormat:arguments:] (in DVTFoundation)
1 0x0000000110060c9f _DVTAssertionHandler (in DVTFoundation)
2 0x0000000110060f8e _DVTAssertionFailureHandler (in DVTFoundation)
3 0x0000000110060ef0 _DVTAssertionFailureHandler (in DVTFoundation)
4 0x000000011341cfd4 +[NSImage(DVTNSImageAdditions) dvt_imageWithSize:scaleFactors:flipped:forRenderingIntoContext:fromCommands:] (in DVTKit)
5 0x00000001132c6d7b +[NSImage(DVTNSImageAdditions) dvt_imageWithSize:scaleFactors:flipped:fromCommands:] (in DVTKit)
6 0x0000000116ccb392 (in IDEInterfaceBuilderCocoaTouchIntegration)
7 0x0000000116ccc003 (in IDEInterfaceBuilderCocoaTouchIntegration)
8 0x0000000116ccc33f (in IDEInterfaceBuilderCocoaTouchIntegration)
9 0x0000000110f4ce71 -[IBICAbstractPlatformAdapter compilePNGImageSetReps:options:queue:completionHandler:] (in IDEInterfaceBuilderKit)
10 0x0000000116cca562 (in IDEInterfaceBuilderCocoaTouchIntegration)
11 0x0000000116ccaa9c (in IDEInterfaceBuilderCocoaTouchIntegration)
12 0x000000010fe62b65 (in ibtoold)
13 0x000000010fe642db (in ibtoold)
14 0x000000010fe6487e (in ibtoold)
15 0x000000010fe723f7 (in ibtoold)
16 0x000000010fe72947 (in ibtoold)
17 0x000000010fe72817 (in ibtoold)
18 0x000000010fe61c3f (in ibtoold)
19 0x000000010fe71fe1 (in ibtoold)
20 0x000000010fe71238 (in ibtoold)
21 0x00007fff8fc765c9 start (in libdyld.dylib)
Command /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin/actool failed with exit code 255