android Activity is declered on Manifest but exceptions says it is not -

android Activity is declered on Manifest but exceptions says it is not -

i have worked activities many times, don't know why exception happened, want start activity when user clicks on button , got exception says haven't declare activity on manifest did,

mainfest <activity android:name=".address" android:label="@string/app_name" > </activity>

try this:

try 1 time total bundle name like

<activity android:name="com.package_name.file_name " android:label="@string/app_name" > </activity>

android android-activity