java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android_examples.com.tabhost/com.android_examples.com.tabhost.MainActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android_examples.com.tabhost/com.android_examples.com.tabhost.TabActivity_1}: java.lang.NullPointerException

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Unable to start activity ComponentInfo{com.android_examples.com.tabhost/com.android_examples.com.tabhost.MainActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android_examples.com.tabhost/com.android_examples.com.tabhost.TabActivity_1}: java.lang.NullPointerException
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Unable to start activity ComponentInfo{com.example.tabhost/com.example.tabhost.AndroidTabLayoutActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.tabhost/com.example.tabhost.PhotosActivity}: java.lang.NullPointerException
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android_examples.com.tabhost/com.android_examples.com.tabhost.MainActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android_examples.com.tabhost/com.android_examples.com.tabhost.TabActivity_1}: java.lang.NullPointerException
at com.android_examples.com.tabhost.TabActivity_1.onCreate(TabActivity_1.java:50)
at android.app.Activity.performCreate(Activity.java:5133)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
at android.app.ActivityThread.startActivityNow(ActivityThread.java:2054)
at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:135)
at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:347)
at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:749)
at android.widget.TabHost.setCurrentTab(TabHost.java:413)
at android.widget.TabHost.addTab(TabHost.java:240)
at com.android_examples.com.tabhost.MainActivity.onCreate(MainActivity.java:44)
at android.app.Activity.performCreate(Activity.java:5133)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)

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