Android Mobile Application crashing

03-30 21:40:36.309 12618-12618/? E/AndroidRuntime﹕ FATAL EXCEPTION: main android.content.ActivityNotFoundException: Unable to find explicit activity class {com.project.mobileshoppingassistant/com.project.mobileshoppingassistant.indoor.MapViewActivity}; have you declared this activity in your AndroidManifest.xml? at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1545) at android.app.Instrumentation.execStartActivity(Instrumentation.java:1420) at android.app.Activity.startActivityForResult(Activity.java:3446) at android.app.Activity.startActivityForResult(Activity.java:3407) at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:784) at android.app.Activity.startActivity(Activity.java:3617) at android.app.Activity.startActivity(Activity.java:3585) at com.project.mobileshoppingassistant.activity.MainActivity.onClick(MainActivity.java:72) at android.view.View.performClick(View.java:4211) at android.view.View$PerformClick.run(View.java:17267) at android.os.Handler.handleCallback(Handler.java:615) at android.os.Handler.dispatchMessage(Handler.java:92) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:4898) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1006) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:773) at dalvik.system.NativeStart.main(Native Method) 03-30 21:40:36.374 2279-2373/? E/android.os.Debug﹕ !@Dumpstate > dumpstate -k -t -z -d -o /data/log/dumpstate_app_error

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Anyone can help me please ?