java.lang.RuntimeException: Unable to start activity ComponentInfo{com.MQ.music.conti_maker_demo/com.MQ.music.conti_maker_demo.GUI_main}: java.lang.NullPointerException
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1970)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1995)
at android.app.ActivityThread.access$600(ActivityThread.java:128)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1161)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4514)
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:790)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:557)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.NullPointerException
at java.nio.charset.ModifiedUtf8.countBytes(ModifiedUtf8.java:75)
at java.nio.charset.ModifiedUtf8.encode(ModifiedUtf8.java:119)
at java.io.DataOutputStream.writeUTF(DataOutputStream.java:197)
at com.MQ.music.conti_maker_demo.Client.CheckMyPhoneID(Client.java:162)
at com.MQ.music.conti_maker_demo.GUI_main.SetAccess(GUI_main.java:96)
at com.MQ.music.conti_maker_demo.GUI_main.onCreate(GUI_main.java:78)
at android.app.Activity.performCreate(Activity.java:4465)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1053)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1934)
... 11 more

------------------------------------------------------------------------

Caused by: java.lang.NullPointerException
at java.nio.charset.ModifiedUtf8.countBytes(ModifiedUtf8.java:75)
at java.nio.charset.ModifiedUtf8.encode(ModifiedUtf8.java:119)

이부분의 에러가 왜 날까요?

다른 폰은 갠찮은데 ... 겔럭시 tab 10.1 에서만 에러가 납니다.