libpng error: Not a PNG file

[2013-05-31 16:28:09 - xxx_jilin] libpng error: Not a PNG file

[2013-05-31 16:36:19 - xxx_jilin] D:\xxxxxxx\bill_baselist.xml:2: error: Error: No resource found that matches the given name (at 'background' with value '@drawable/sys_background').

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遇到这种问题，一般都是png的格式问题，将有问题的png图片，重新用windows自带的画图工具，另存为png格式就好了