求大神看下

这是怎么回事
2015-07-25 16:11:43 (App.java:141) [INFO ]:工具已启动
2015-07-25 16:11:46 (App.java:292) [DEBUG]:开始反编译xml文件
2015-07-25 16:11:49 (App.java:330) [ERROR]:
java.lang.NullPointerException
at java.io.Writer.write(Unknown Source)
at brut.androlib.res.util.ExtMXSerializer.writeAttributeValue(ExtMXSerializer.java:38)
at org.xmlpull.mxp1_serializer.MXSerializer.attribute(MXSerializer.java:673)
at org.xmlpull.v1.wrapper.classic.XmlSerializerDelegate.attribute(XmlSerializerDelegate.java:106)
at org.xmlpull.v1.wrapper.classic.StaticXmlSerializerWrapper.writeStartTag(StaticXmlSerializerWrapper.java:267)
at org.xmlpull.v1.wrapper.classic.StaticXmlSerializerWrapper.event(StaticXmlSerializerWrapper.java:211)
at brut.androlib.res.decoder.XmlPullStreamDecoder.decode(XmlPullStreamDecoder.java:46)
at brut.androlib.res.decoder.ResStreamDecoderContainer.decode(ResStreamDecoderContainer.java:34)
at brut.androlib.res.decoder.ResFileDecoder.decode(ResFileDecoder.java:100)
at brut.androlib.res.decoder.ResFileDecoder.decode(ResFileDecoder.java:86)
at brut.androlib.res.AndrolibResources.decode(AndrolibResources.java:132)
at brut.androlib.Androlib.decodeResourcesFull(Androlib.java:93)
at brut.androlib.ApkDecoder.decode(ApkDecoder.java:98)
at brut.apktool.Main.cmdDecode(Main.java:128)
at brut.apktool.Main.main(Main.java:65)
at com.mikameng.tool.App.deCompileXml(App.java:245)
at com.mikameng.tool.App.access$500(App.java:26)
at com.mikameng.tool.App$DeCompile.run(App.java:320)
2015-07-25 16:11:51 (App.java:292) [DEBUG]:反编译完成....