exception in exporting rad grid to pdf

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ASP.NET

Telerik

hi I have a grid , and have marked its exporting settings to PDF,word,excel and csv,
on exporting to PDF it gives the following exception:

System.Xml.XmlException: The '{' character, hexadecimal value 0x7B, cannot be included in a name.

the code done is:

<ExportSettings>
                          <Pdf PageHeight="210mm" PageWidth="350mm" PageTitle="Child Suppliers" DefaultFontFamily="Arial Unicode MS"
                              PageBottomMargin="20mm" PageTopMargin="20mm" PageLeftMargin="20mm" PageRightMargin="20mm" />
                      </ExportSettings>

.cs file includes:

protected void grdPlan_ItemCommand(object sender, GridCommandEventArgs e)
       {
           try
           {
               base.InsertOrEdit(grdPlan, e);
               if (e.CommandName.Equals(RadGrid.ExportToExcelCommandName) ||
                  e.CommandName.Equals(RadGrid.ExportToCsvCommandName) ||
                  e.CommandName.Equals(RadGrid.ExportToPdfCommandName) ||
                  e.CommandName.Equals(RadGrid.ExportToWordCommandName))
               {
                   base.ConfigureExport(grdPlan);
               }
           }
           catch (SysXException ex)
           {
               SysXWebSiteUtils.LoggerService.GetLogger().Error(ex.Message, ex, LogModule.SupplierMaster);
               lblErrorMessage.ShowMessage(ex.Message, MessageType.Error);
           }
           catch (Exception ex)
           {
               SysXWebSiteUtils.LoggerService.GetLogger().Error(ex.Message, ex, LogModule.SupplierMaster);
               lblErrorMessage.ShowMessage(ex.Message, MessageType.Error);
           }
       }

does anyone has any idea???