关于安卓的报错错误解决！

Question

之前程序测试的时候能正常运行，现在加了点内容几个类，就报错了。！！！
具体错误如下；
04-09 00:25:55.687 8058-8058/com.samuel.schat W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x40e2b258)
04-09 00:25:55.703 8058-8058/com.samuel.schat E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.NullPointerException
at android.widget.ListView.setupChild(ListView.java:1817)
at android.widget.ListView.makeAndAddView(ListView.java:1795)
at android.widget.ListView.fillDown(ListView.java:676)
at android.widget.ListView.fillFromTop(ListView.java:736)
at android.widget.ListView.layoutChildren(ListView.java:1637)
at android.widget.AbsListView.onLayout(AbsListView.java:1924)
at android.view.View.layout(View.java:11315)
at android.view.ViewGroup.layout(ViewGroup.java:4314)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:925)
at android.view.View.layout(View.java:11315)
at android.view.ViewGroup.layout(ViewGroup.java:4314)
at android.widget.FrameLayout.onLayout(FrameLayout.java:431)
at android.view.View.layout(View.java:11315)
at android.view.ViewGroup.layout(ViewGroup.java:4314)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1633)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1491)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1404)
at android.view.View.layout(View.java:11315)
at android.view.ViewGroup.layout(ViewGroup.java:4314)
at android.widget.FrameLayout.onLayout(FrameLayout.java:431)
at android.view.View.layout(View.java:11315)
at android.view.ViewGroup.layout(ViewGroup.java:4314)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1625)
at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2642)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4624)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:965)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:732)
at dalvik.system.NativeStart.main(Native Method)

Answer 1

空指针异常。。。。。。