我用的ewebeditor的文本编辑器，在我本机上传图片没问题，可是把站点挪到服务器就不能上传了？

 这是ewebeditor保存图片的代码，请大侠们帮忙解决解决。
   /// <summary>
    /// 保存文件
    /// </summary>
    /// <param name="UpLoadPath">路径</param>
    /// <param name="FileType">文件类型</param>
    private void SaveAs(string UpLoadPath,string FileType)
    {
        bool UpFileOk = false;
        string[] AllowFileExtensions = null;
        if (FileUpload1.HasFile)
        {
            string currectFileExtension = Path.GetExtension(FileUpload1.FileName).ToLower();
            AllowFileExtensions = GetConfigInfo(FileType, "config.config").Split('|');
            for (int i = 0; i < AllowFileExtensions.Length; i++)
            {
                if (currectFileExtension == AllowFileExtensions[i].ToLower())
                {
                    UpFileOk = true;
                    break;
                }
            }
        }
        if (UpFileOk)
        {
            if (Directory.Exists(Server.MapPath(UpLoadPath)))
            {
                try
                {
                    FileUpload1.SaveAs(Server.MapPath(UpLoadPath + FileUpload1.FileName));
                    InsertFilePath.Value = Request.Path.Substring(0, Request.Path.LastIndexOf("/")+1) + UpLoadPath + FileUpload1.FileName;
                    uploadPanel.Visible = false;
                    resultPanel.Visible = true;
                }
                catch
                {
                    Response.Redirect("Error.htm");
                }
            }
            else
            {
                try
                {
                    Directory.CreateDirectory(Server.MapPath(UpLoadPath));
                    FileUpload1.SaveAs(Server.MapPath(UpLoadPath + FileUpload1.FileName));
                    InsertFilePath.Value = Request.Path.Substring(0, Request.Path.LastIndexOf("/")+1) + UpLoadPath + FileUpload1.FileName;
                    uploadPanel.Visible = false;
                    resultPanel.Visible = true;
                }
                catch 
                {
                    Response.Redirect("Error.htm");
                }
            }
        }
        else
        {
            Response.Write("<script>alert('格式不正确');history.back(-1)</script>");
        }
    }
在本地都会提示上传成功，可是在服务器就提示上传失败。会跳到Error.htm，怎么回事啊？