OAViewRowImpl，OAViewObjectImpl 引入有错吗

  public void processFormRequest(OAPageContext pageContext, OAWebBean webBean)
  {
    super.processFormRequest(pageContext, webBean);
    OAApplicationModule am=pageContext.getApplicationModule(webBean);
    if (pageContext.getParameter("Apply")!=null)
    {
      DataObject fileUpLoadData=pageContext.getNamedDataObject("FileData");
      System.out.println("fileUpLoadData=="+fileUpLoadData);
      String uFileName=(String)fileUpLoadData.selectValue(null,"UPLOAD_FILE_NAME");
      System.out.println("uFileName=="+uFileName);
      OAViewObject vo=(OAViewObject)am.findViewObject("LoadVO1");
      LoadVORowImpl row=(LoadVORowImpl)vo.getCurrentRow();
      row.setFileName(uFileName);
    }
  }Error(68,7): class LoadVORowImpl not found in class oracle.apps.ak.download.webui.webui.UploadFileCO
Error(68,26): class LoadVORowImpl not found in class oracle.apps.ak.download.webui.webui.UploadFileCO
import oracle.apps.fnd.framework.server.OAViewRowImpl;
import oracle.apps.fnd.framework.server.OAViewObjectImpl;