File Upload in struts2 - Invalid field value for field

struts.xml ->

    <action name="uploadingFile" class="action.FileUpload">
        <result name="success">/uploadSuccessful.jsp</result>
        <result name="input">/upload.jsp</result>
    </action>

</package>

package 'action' has FileUpload.java ->

package action;

import java.io.File; import java.io.IOException;

import org.apache.commons.io.FileUtils; import com.opensymphony.xwork2.ActionSupport;

public class FileUpload extends ActionSupport {

private static final long serialVersionUID = 1L;
private File upload;
private String uploadContentType;
    private String uploadFileName;

public String execute() {
    System.out.println("inside execute");
        String fullFileName = "e:\\upload\\myFile.txt";
        File theFile = new File(fullFileName);

        try {
            FileUtils.copyFile(upload, theFile);
            return "success";
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return "input";
        }       

}


public File getUpload() {
    return upload;
}


public void setUpload(File upload) {
    this.upload = upload;
}

public String getUploadContentType() {
    return uploadContentType;
}

public void setUploadContentType(String uploadContentType) {
    this.uploadContentType = uploadContentType;
}

public String getUploadFileName() {
    return uploadFileName;
}

public void setUploadFileName(String uploadFileName) {
    this.uploadFileName = uploadFileName;
}

}

As i click submit .. i get Invalid field value for field "upload". on jsp page but not in console

Please guide I am stuck to this for long

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