报错如下：
Error:Failed to run command:
D:\Program Files\Android\android-sdk\build-tools\20.0.0\aapt.exe s -i C:\Users\Administrator\AndroidstudioProjects\EBook21\app\src\main\res\drawable-hdpi\start.png -o C:\Users\Administrator\AndroidstudioProjects\EBook21\app\build\intermediates\res\release\drawable-hdpi-v4\start.png
Error Code:
42
Output:
libpng error: Not a PNG file
:app:mergeReleaseResources FAILED
Error:Execution failed for task ':app:mergeReleaseResources'.
Error: Failed to run command:
D:\Program Files\Android\android-sdk\build-tools\20.0.0\aapt.exe s -i C:\Users\Administrator\AndroidstudioProjects\EBook21\app\src\main\res\drawable-hdpi\start.png -o C:\Users\Administrator\AndroidstudioProjects\EBook21\app\build\intermediates\res\release\drawable-hdpi-v4\start.png
Error Code:
42
Output:
libpng error: Not a PNG file
是什么意思？我删掉build文件夹，重新发布，依旧报这个错
哪位大神好心指导一下。。。
