Java file in my module

MainActivity.java

/**
 * This file was auto-generated by the Titanium Module SDK helper for Android
 * Appcelerator Titanium Mobile
 * Copyright (c) 2009-2017 by Appcelerator, Inc. All Rights Reserved.
 * Licensed under the terms of the Apache Public License
 * Please see the LICENSE included with this distribution for details.
 *
 */
package com.example.ble;

import org.appcelerator.kroll.KrollModule;
import org.appcelerator.kroll.annotations.Kroll;

import org.appcelerator.titanium.TiApplication;
import org.appcelerator.kroll.common.Log;
import org.appcelerator.kroll.common.TiConfig;
import android.graphics.Bitmap;
import java.nio.ByteBuffer;
import android.graphics.Color;

@Kroll.module(name="BLEModule", id="com.example.ble")
public class BLEModuleModule extends KrollModule
{

	// Standard Debugging variables
	private static final String LCAT = "BLEModuleModule";
	private static final boolean DBG = TiConfig.LOGD;

	// You can define constants with @Kroll.constant, for example:
	// @Kroll.constant public static final String EXTERNAL_NAME = value;

	public BLEModuleModule()
	{
		super();
	}

	@Kroll.onAppCreate
	public static void onAppCreate(TiApplication app)
	{
		Log.d(LCAT, "inside onAppCreate");
		// put module init code that needs to run when the application is created
	}

	// Methods
	@Kroll.method
	public String example()
	{
		Log.d(LCAT, "example called");
		return "hello world";
	}

	// Properties
	@Kroll.getProperty
	public String getExampleProp()
	{
		Log.d(LCAT, "get example property");
		return "hello world";
	}
	//This what I am trying to do. 
	 // Properties
	@Kroll.getProperty
	public byte[] getByteArrayFromBitmap(Bitmap bitmap)
	{
		int[] pixels = new int[bitmap.getWidth() * bitmap.getHeight()];
        bitmap.getPixels(pixels, 0, bitmap.getWidth(), 0, 0,
                bitmap.getWidth(), bitmap.getHeight());

        ByteBuffer eightByteBuffer = ByteBuffer.allocate(pixels.length);

        for (int i = 0; i < pixels.length; i++) {
            int p = pixels[i];

            int red = Color.red(p);
            int green = Color.green(p);
            int blue = Color.blue(p);

            byte p1Rgb = (byte) (((int) Math.round(red / 255.0 * 7.0) << 5) |
                    ((int) Math.round(green / 255.0 * 7.0) << 2) |
                    ((int) Math.round(blue / 255.0 * 3.0)));

            eightByteBuffer.put(p1Rgb);
        }


        return eightByteBuffer.array();
	}

	@Kroll.setProperty
	public void setExampleProp(String value) {
		Log.d(LCAT, "set example property: " + value);
	}

}

i am getting error here

@Kroll.getProperty
public byte[] getByteArrayFromBitmap(Bitmap bitmap)
{
int[] pixels = new int[bitmap.getWidth() * bitmap.getHeight()];
bitmap.getPixels(pixels, 0, bitmap.getWidth(), 0, 0,
bitmap.getWidth(), bitmap.getHeight());

    ByteBuffer eightByteBuffer = ByteBuffer.allocate(pixels.length);

    for (int i = 0; i < pixels.length; i++) {
        int p = pixels[i];

        int red = Color.red(p);
        int green = Color.green(p);
        int blue = Color.blue(p);

        byte p1Rgb = (byte) (((int) Math.round(red / 255.0 * 7.0) << 5) |
                ((int) Math.round(green / 255.0 * 7.0) << 2) |
                ((int) Math.round(blue / 255.0 * 3.0)));

        eightByteBuffer.put(p1Rgb);
    }


    return eightByteBuffer.array();
}