안드로이드 액티비티 전환문제

액티비티를 전환하는 기본적인 문제인데요

메니페스트 파일에도 액티비티 등록을 했는데 전환이 안되네요

로그캣에는 다음과 같은 오류가 뜨는데.. 어떻게 해결해야 할까요?

android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.ymacbook.a1wordic/com.example.ymacbook.a1wordic.Activity_5}; have you declared this activity in your AndroidManifest.xml?

at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1794)

at android.app.Instrumentation.execStartActivity(Instrumentation.java:1512)

at android.app.Activity.startActivityForResult(Activity.java:3917)

at android.app.Activity.startActivityForResult(Activity.java:3877)

at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:843)

at android.app.Activity.startActivity(Activity.java:4200)

at android.app.Activity.startActivity(Activity.java:4168)

at com.example.ymacbook.a1wordic.MainActivity$1.onClick(MainActivity.java:78)

at android.view.View.performClick(View.java:5198)

at android.view.View$PerformClick.run(View.java:21147)

at android.os.Handler.handleCallback(Handler.java:739)

at android.os.Handler.dispatchMessage(Handler.java:95)

at android.os.Looper.loop(Looper.java:148)

at android.app.ActivityThread.main(ActivityThread.java:5417)

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

at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

메니페스트 파일

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <activity
            android:name=".Activity_2"
            android:label="@string/activity_2" >
        </activity>

        <activity
            android:name=".Activity_3"
            android:label="@string/activity_3" >
        </activity>

        <activity
            android:name=".Activity_4"
            android:label="@string/activity_4" >
        </activity>

        <activity
            android:name=".Activity_5"
            android:label="@string/activity_5" >
        </activity>


    </application>

    <uses-permission android:name="android.permission.INTERNET"/>

</manifest>

Activity 2, 3, 4는 화면전환이 가능한데 5가 문제네요..!