Application Has Stopped Unexpectedly Errór

I am new to android programming and I tried searching up how to fix this error;however, I still cannot figure out what I did wrong. I just follow the youtube tutorials and decided to create my own program in order to practice. I am not done with the program yet, but basically, I am trying to link the button from my .main xml ( aka menu class) to the triangle_guide.xml page, but for some reason, it's not working. Please help. thanks a lot.

LogCat

09-14 04:44:16.444: E/AndroidRuntime(277): FATAL EXCEPTION: main
09-14 04:44:16.444: E/AndroidRuntime(277): java.lang.IllegalStateException: Could not find a method btnGuide(View) in the activity class com.example.trianglegame.MainActivity for onClick handler on view class android.widget.Button with id 'btnGuide'
09-14 04:44:16.444: E/AndroidRuntime(277):  at android.view.View$1.onClick(View.java:2059)
09-14 04:44:16.444: E/AndroidRuntime(277):  at android.view.View.performClick(View.java:2408)
09-14 04:44:16.444: E/AndroidRuntime(277):  at android.view.View$PerformClick.run(View.java:8816)
09-14 04:44:16.444: E/AndroidRuntime(277):  at android.os.Handler.handleCallback(Handler.java:587)
09-14 04:44:16.444: E/AndroidRuntime(277):  at android.os.Handler.dispatchMessage(Handler.java:92)
09-14 04:44:16.444: E/AndroidRuntime(277):  at android.os.Looper.loop(Looper.java:123)
09-14 04:44:16.444: E/AndroidRuntime(277):  at android.app.ActivityThread.main(ActivityThread.java:4627)
09-14 04:44:16.444: E/AndroidRuntime(277):  at java.lang.reflect.Method.invokeNative(Native Method)
09-14 04:44:16.444: E/AndroidRuntime(277):  at java.lang.reflect.Method.invoke(Method.java:521)
09-14 04:44:16.444: E/AndroidRuntime(277):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
09-14 04:44:16.444: E/AndroidRuntime(277):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
09-14 04:44:16.444: E/AndroidRuntime(277):  at dalvik.system.NativeStart.main(Native Method)
09-14 04:44:16.444: E/AndroidRuntime(277): Caused by: java.lang.NoSuchMethodException: btnGuide
09-14 04:44:16.444: E/AndroidRuntime(277):  at java.lang.ClassCache.findMethodByName(ClassCache.java:308)
09-14 04:44:16.444: E/AndroidRuntime(277):  at java.lang.Class.getMethod(Class.java:985)
09-14 04:44:16.444: E/AndroidRuntime(277):  at android.view.View$1.onClick(View.java:2052)
09-14 04:44:16.444: E/AndroidRuntime(277):  ... 11 more

MainActivity Java Code

package com.example.trianglegame;

import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;

public class MainActivity extends ActionBarActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}
}

Menu Button Class

package com.example.trianglegame;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MenuBtn extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    Button btnGuide = (Button) findViewById(R.id.btnGuide);
    btnGuide.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
            Intent intent = new Intent(v.getContext(), TriangleGuide.class);
            startActivityForResult(intent, 0);
        }
    }

    );

 }

}

Guide Class

package com.example.trianglegame;

import android.app.Activity;
import android.os.Bundle;

public class TriangleGuide extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.triangle_guide);
}

@Override
protected void onPause() {
    // TODO Auto-generated method stub
    super.onPause();
}

}

Android Manifest

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://ift.tt/nIICcg"
package="com.example.trianglegame"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="21" />

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

</manifest>

.main xml

<RelativeLayout xmlns:android="http://ift.tt/nIICcg"
xmlns:tools="http://ift.tt/LrGmb4"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/background"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.trianglegame.MainActivity" >

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:gravity="center"
    android:text="@string/Welcome"
    android:textSize="25sp" />

<TextView
    android:id="@+id/textView2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/textView1"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="20sp"
    android:text="@string/select_option" />

<Button
    android:id="@+id/btnGuide"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/textView2"
    android:layout_below="@+id/textView2"
    android:layout_marginLeft="34dp"
    android:layout_marginTop="113dp"
    android:text="@string/guide_btn"
    android:onClick="btnGuide" />

<Button
    android:id="@+id/btnGame"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/textView2"
    android:layout_below="@+id/btnGuide"
    android:layout_marginLeft="34dp"
    android:text="@string/game_btn" />

</RelativeLayout>

triangle_guide.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://ift.tt/nIICcg"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/t_tri"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="@string/e_tri"
        android:textSize="15sp"
        android:textStyle="bold" />

    <View
        android:layout_width="1dp"
        android:layout_height="40dp"
        android:layout_weight="1" />

    <ImageView
        android:id="@+id/e_triangle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:contentDescription="@string/e_tri"
        android:src="@drawable/e_triangle" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="@string/e_tri" />

     <View
        android:layout_width="1dp"
        android:layout_height="40dp"
        android:layout_weight="1" />

    <ImageView
        android:id="@+id/i_triangle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:contentDescription="@string/i_tri"
        android:src="@drawable/i_triangle" />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="@string/i_tri" />

    <View
        android:layout_width="1dp"
        android:layout_height="40dp"
        android:layout_weight="1" />

    <ImageView
        android:id="@+id/s_triangle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:contentDescription="@string/s_tri"
        android:src="@drawable/s_triangle" />
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="@string/s_tri" />

    <TextView>
    </TextView>
</LinearLayout>

</ScrollView>