java.lang.reflect.InvocationTargetExcepti，请热心友人帮忙看看的

04-06 15:48:03.797: W/System.err(530): java.lang.reflect.InvocationTargetException04-06 15:48:03.816: W/System.err(530):     at android.net.vpn.VpnManager.startVpnService(VpnManager.java:140)04-06 15:48:03.816: W/System.err(530):     at java.lang.reflect.Method.invokeNative(Native Method)04-06 15:48:03.816: W/System.err(530):     at java.lang.reflect.Method.invoke(Method.java:521)04-06 15:48:03.816: W/System.err(530):     at xink.vpn.wrapper.AbstractWrapper.invokeStubMethod(AbstractWrapper.java:117)04-06 15:48:03.847: W/System.err(530):     at xink.vpn.wrapper.VpnManager.startVpnService(VpnManager.java:44)04-06 15:48:03.847: W/System.err(530):     at xink.vpn.VpnActor.connect(VpnActor.java:78)04-06 15:48:03.847: W/System.err(530):     at xink.vpn.Connec$ButtonListener.onClick(Connec.java:77)04-06 15:48:03.856: W/System.err(530):     at android.view.View.performClick(View.java:2408)04-06 15:48:03.856: W/System.err(530):     at android.view.View$PerformClick.run(View.java:8816)04-06 15:48:03.856: W/System.err(530):     at android.os.Handler.handleCallback(Handler.java:587)04-06 15:48:03.856: W/System.err(530):     at android.os.Handler.dispatchMessage(Handler.java:92)04-06 15:48:03.856: W/System.err(530):     at android.os.Looper.loop(Looper.java:123)04-06 15:48:03.856: W/System.err(530):     at android.app.ActivityThread.main(ActivityThread.java:4627)04-06 15:48:03.856: W/System.err(530):     at java.lang.reflect.Method.invokeNative(Native Method)04-06 15:48:03.866: W/System.err(530):     at java.lang.reflect.Method.invoke(Method.java:521)04-06 15:48:03.866: W/System.err(530):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)04-06 15:48:03.866: W/System.err(530):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)04-06 15:48:03.866: W/System.err(530):     at dalvik.system.NativeStart.main(Native Method)04-06 15:48:03.866: W/System.err(530): Caused by: java.lang.NullPointerException

public void startVpnService() {        System.out.println("vpnmanager ------ 43 ------startVpnService()");        invokeStubMethod(METHOD_START_VPN_SERVICE);}METHOD_START_VPN_SERVICE=“startVpnService”；protected <T> T invokeStubMethod(final String methodName, final Object... args) {        try {            System.out.println("abstractwrapper ---------113" + methodName + " -----" + args);            Method method = findStubMethod(methodName, args);            return (T) method.invoke(stub, args);        } catch (Exception e) {            e.printStackTrace();            // System.out.println("exception ------"+e.printStackTrace());            throw new WrapperException("failed to invoke mehod '" + methodName + "' on stub", e);        }    }