[Android] ปัญหาการ Import Source code แล้วไม่สามารถ run ได้ครับ

11-26 11:00:02.696: E/AndroidRuntime(13116): FATAL EXCEPTION: main
11-26 11:00:02.696: E/AndroidRuntime(13116): java.lang.RuntimeException: Unable to start activity ComponentInfo

{com.app.Market/com.app.Market.Market}: java.lang.NullPointerException
11-26 11:00:02.696: E/AndroidRuntime(13116): 	at android.app.ActivityThread.performLaunchActivity

(ActivityThread.java:2669)
11-26 11:00:02.696: E/AndroidRuntime(13116): 	at android.app.ActivityThread.handleLaunchActivity

(ActivityThread.java:2685)
11-26 11:00:02.696: E/AndroidRuntime(13116): 	at android.app.ActivityThread.access$2300(ActivityThread.java:126)
11-26 11:00:02.696: E/AndroidRuntime(13116): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2038)
11-26 11:00:02.696: E/AndroidRuntime(13116): 	at android.os.Handler.dispatchMessage(Handler.java:99)
11-26 11:00:02.696: E/AndroidRuntime(13116): 	at android.os.Looper.loop(Looper.java:123)
11-26 11:00:02.696: E/AndroidRuntime(13116): 	at android.app.ActivityThread.main(ActivityThread.java:4633)
11-26 11:00:02.696: E/AndroidRuntime(13116): 	at java.lang.reflect.Method.invokeNative(Native Method)
11-26 11:00:02.696: E/AndroidRuntime(13116): 	at java.lang.reflect.Method.invoke(Method.java:521)
11-26 11:00:02.696: E/AndroidRuntime(13116): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run

(ZygoteInit.java:858)
11-26 11:00:02.696: E/AndroidRuntime(13116): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
11-26 11:00:02.696: E/AndroidRuntime(13116): 	at dalvik.system.NativeStart.main(Native Method)
11-26 11:00:02.696: E/AndroidRuntime(13116): Caused by: java.lang.NullPointerException
11-26 11:00:02.696: E/AndroidRuntime(13116): 	at com.app.Market.Market.setlang(Market.java:431)
11-26 11:00:02.696: E/AndroidRuntime(13116): 	at com.app.Market.Market.onCreate(Market.java:75)
11-26 11:00:02.696: E/AndroidRuntime(13116): 	at android.app.Instrumentation.callActivityOnCreate

(Instrumentation.java:1047)
11-26 11:00:02.696: E/AndroidRuntime(13116): 	at android.app.ActivityThread.performLaunchActivity

(ActivityThread.java:2633)
11-26 11:00:02.696: E/AndroidRuntime(13116): 	... 11 more