Error parsing document. (position:line -1, column -1) 异常

org.xmlpull.v1.XmlPullParserException: Error parsing document. (position:line -1, column -1) caused by: org.apache.harmony.xml.ExpatParser$ParseException: At line 1, column 0: unknown encoding
at org.apache.harmony.xml.ExpatPullParser$ByteDocument.flush(ExpatPullParser.java:959)
at org.apache.harmony.xml.ExpatPullParser$Document.pump(ExpatPullParser.java:770)
at org.apache.harmony.xml.ExpatPullParser$Document.dequeue(ExpatPullParser.java:814)
at org.apache.harmony.xml.ExpatPullParser.next(ExpatPullParser.java:303)
at com.kang.youku.service.NetUtil.getChanels(NetUtil.java:62)
at com.kang.youku.test.TestNetUtil.testGetChanels(TestNetUtil.java:12)
at java.lang.reflect.Method.invokeNative(Native Method)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:169)
at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:154)
at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:520)
at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1447)

这个异常时解析xml文件 解析编码不对造成的