Android Fun facts " Unfortunately, Fun Facts has stopped." Error

package com.iamakash.funfacts;

import android.graphics.Color;

import java.util.Random;

/**
 * Created by akash on 2015-07-26.
 */
public class colorwheel {

    public String[] mcolors = {
            "#39add1",
            "#3079ab",
            "#c25975",
            "#e15258",
            "#f9845b",
            "#838cc7",
            "#7d669e",
            "#53bbb4",
            "#51b46d",
            "#e0ab18",
            "#637a91",
            "#f092b0",
            "#b7c0c7",
            "#4169E1",
            "#F0F8FF",
            "#FFEBCD",
            "#F5F5DC",
            "#FFE4C4 ",
           " #000000",
            "#FFEBCD",
           " #0000FF",
           " #8A2BE2",
    };
    public int getcolor(){

        //button clicked, update with new fact
        String COLOR = "";
        //randomly select fact
        Random randomGenerator = new Random();
        int randomNumber = randomGenerator.nextInt(mcolors.length);
        COLOR=mcolors[randomNumber];
        int colorAsInt= Color.parseColor(COLOR);
        return colorAsInt;
    }


}

import java.util.Random;


public class factBook {

    public String[] mfacts = {
            "Ants stretch when they wake up in the morning.",
            "Ostriches can run faster than horses.",
            "Olympic gold medals are actually made mostly of silver.",
   "You are born with 300 bones; by the time you are an adult you will have 206.",
         "It takes about 8 minutes for light from the Sun to reach  Earth.",
       "Some bamboo plants can grow almost a meter in just one day.",

    };
    public String getFact(){

    //button clicked, update with new fact
    String fact = "";
    //randomly select fact
    Random randomGenerator = new Random();
    int randomNumber = randomGenerator.nextInt(mfacts.length);
    fact=mfacts[randomNumber];
    return fact;
    }


}

import android.app.Activity;
import android.app.DatePickerDialog;
import android.graphics.Color;
import android.support.v7.app.ActionBar;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.TextView;
import java.util.*;


public class FunFactsActivity extends Activity {
    private factBook mFactBook=new factBook();
    private colorwheel mcolorwheel= new colorwheel();


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


    //declare view variables

    final TextView factlabel = (TextView) findViewById(R.id.facttextView);
    final Button showFactButton = (Button) findViewById(R.id.showfactbutton);
        final RelativeLayout relativeLayout=(RelativeLayout) findViewById(R.id.relativeLayout);
        View.OnClickListener Listener = new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                String fact= mFactBook.getFact();



                //update label with dynamic fact

                factlabel.setText(fact);
                int color=mcolorwheel.getcolor();
                relativeLayout.setBackgroundColor(color);



            };
        };


    showFactButton.setOnClickListener(Listener);
};



    };