Android : SimpleXML Android Error ValueRequiredException

I am integrating SimpleXml deserialization but got exception every time. Don't know what is the exact reason. Please check the details provided under this question. Thanks in advance.

Below are the model classes .

import java.util.ArrayList;

import org.simpleframework.xml.ElementList;
import org.simpleframework.xml.Root;

@Root(name = "images")
public class ImagesModel {

    @ElementList(name="image")
    private ArrayList<ImageClass> imgList = new ArrayList<ImageClass>();

    public ArrayList<ImageClass> getImageList(){
        return imgList;
    }
}


import java.util.ArrayList;

import org.simpleframework.xml.Attribute;
import org.simpleframework.xml.Element;
import org.simpleframework.xml.ElementList;

@Element(name = "image")
public class ImageClass {
        @Attribute(name = "name")
        private String imageName;

        public String getImageName(){
            return imageName;
        }

        public ImageClass(String imageName) {
            this.imageName = imageName;
        }

        @ElementList(name="ver")
        private ArrayList<Version> versions = new ArrayList<Version>();

        public ArrayList<Version> getVersionsList(){
            return versions;
        }
    }

import org.simpleframework.xml.Attribute;
import org.simpleframework.xml.Element;

@Element(name = "diff")
public class PixelDetail{
        @Attribute(name = "x")
        private String x;

        public String getX(){
            return x;
        }

        @Attribute(name = "x")
        private String y;

        public String getY(){
            return y;
        }

        public PixelDetail(String x, String y) {
            this.x = x;
            this.y = y;
        }
    }

import java.util.ArrayList;

import org.simpleframework.xml.Element;
import org.simpleframework.xml.ElementList;

@Element(name = "version")
public class Version{
        @ElementList(name="diff")
        private ArrayList<PixelDetail> pixelsData = new ArrayList<PixelDetail>(); 

        public ArrayList<PixelDetail> getPixelsList(){
            return pixelsData;
        }
    }

XML Structure

<images>

    <image name="Org1" >
        <version>
            <ver>
                <diff
                    x="79"
                    y="19" />

                <diff
                    x="215"
                    y="73" />

                <diff
                    x="68"
                    y="202" />

                <diff
                    x="96"
                    y="289" />

                <diff
                    x="173"
                    y="164" />
            </ver>

            <ver>
                <diff
                    x="14 "
                    y="93 " />

                <diff
                    x="57 "
                    y="46 " />

                <diff
                    x=" 192"
                    y="17" />

                <diff
                    x="180 "
                    y="139" />

                <diff
                    x="135 "
                    y="242 " />
            </ver>

            <ver>
                <diff
                    x="286 "
                    y="123" />

                <diff
                    x="31"
                    y="292" />

                <diff
                    x="170"
                    y="216" />

                <diff
                    x="189"
                    y="234" />

                <diff
                    x="131 "
                    y="286" />
            </ver>
        </version>
    </image>
    <image name="Org2" >
        <version>
            <ver>
                <diff
                    x="197"
                    y="41" />

                <diff
                    x="269"
                    y="162" />

                <diff
                    x="297"
                    y="19" />

                <diff
                    x="4"
                    y="52" />

                <diff
                    x="178"
                    y="284" />
            </ver>

            <ver>
                <diff
                    x="213"
                    y="59" />

                <diff
                    x="208"
                    y="97" />

                <diff
                    x="284"
                    y="162" />

                <diff
                    x="193"
                    y="138" />

                <diff
                    x="5"
                    y="221" />
            </ver>

            <ver>
                <diff
                    x="219"
                    y="97" />

                <diff
                    x="40"
                    y="44" />

                <diff
                    x="67"
                    y="21" />

                <diff
                    x="181"
                    y="37" />

                <diff
                    x="208"
                    y="172" />
            </ver>
        </version>
    </image>
</images>

Log Cat Error

09-11 14:52:55.926: W/System.err(5525): org.simpleframework.xml.core.ValueRequiredException: Unable to satisfy @org.simpleframework.xml.Attribute(empty=, name=name, required=true) on field 'imageName' private java.lang.String com.wavinno.iotasol.spotdifference.models.ImageClass.imageName for class com.wavinno.iotasol.spotdifference.models.ImageClass at line 5