Android App Stop work ?

Sep 25 2015 5:45 AM

When I Click On Action Bar icon My App Unfortunately has stopped and this is error is generated

09-25 15:10:40.063 3154-3154/com.abc.navigationdrawer E/AndroidRuntime? FATAL EXCEPTION: main

Process: com.abc.navigationdrawer, PID: 3154

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.abc.navigationdrawer/com.abc.navigationdrawer.CreateAppointmentActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.CharSequence android.support.v7.widget.Toolbar.getTitle()' on a null object reference

at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2298)

at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2360)

at android.app.ActivityThread.access$800(ActivityThread.java:144)

at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1278)

at android.os.Handler.dispatchMessage(Handler.java:102)

at android.os.Looper.loop(Looper.java:135)

at android.app.ActivityThread.main(ActivityThread.java:5221)

at java.lang.reflect.Method.invoke(Native Method)

at java.lang.reflect.Method.invoke(Method.java:372)

at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.CharSequence android.support.v7.widget.Toolbar.getTitle()' on a null object reference

at android.support.v7.internal.widget.ToolbarWidgetWrapper.<init>(ToolbarWidgetWrapper.java:100)

at android.support.v7.internal.widget.ToolbarWidgetWrapper.<init>(ToolbarWidgetWrapper.java:93)

at android.support.v7.internal.app.ToolbarActionBar.<init>(ToolbarActionBar.java:78)

at android.support.v7.app.AppCompatDelegateImplV7.setSupportActionBar(AppCompatDelegateImplV7.java:206)

at android.support.v7.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:99)

at com.abc.navigationdrawer.CreateAppointmentActivity.onCreate(CreateAppointmentActivity.java:17)

at android.app.Activity.performCreate(Activity.java:5937)

at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1105)

at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2251)