what is this error ?

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C#

Silverlight

The error:

Error 1 Analysis rules Element ::= . EmptyElement | ( StartElement ElementBody ). In the accident
PROPERTYELEMENT。 E:\Test\SLReportTest\SLReportTest\MainPage.xaml SLReportTest

The question：
what is this error ? How to solve it? Thank you very much.


I am a Chinese. I like telerik so much.
The description of this problem with Chinese is as follows ：
错误 1 分析规则 Element ::= . EmptyElement | ( StartElement ElementBody ). 中的意外 PROPERTYELEMENT。 E:\Test\SLReportTest\SLReportTest\MainPage.xaml SLReportTest

The complete XAML code as follows:

<usercontrol x:class="SLReportTest.MainPage" xmlns:x="#unknown">
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
    xmlns:toolkit="http://schemas.microsoft.com/winfx/2006/xaml/presentation/toolkit"
    xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk"
    d:DesignHeight="543" d:DesignWidth="1100" Width="Auto" Height="Auto" grid x:name="LayoutRoot" removed="White"
        <telerik:radgridview xmlns:telerik="#unknown"></telerik:radgridview> x:Name="rgv_list" Grid.Row="1" AutoExpandGroups="True" 
                 ShowColumnFooters="False" ShowGroupFooters="True"
                 AutoGenerateColumns="False"  ShowGroupPanel="False"
                 IsReadOnly="True" CanUserFreezeColumns="False" RowIndicatorVisibility="Collapsed"
                 CanUserResizeColumns="True" 
            telerik:radgridview.columns xmlns:telerik="#unknown"
                telerik:gridviewdatacolumn width="*" xmlns="http://schemas.microsoft.com/client/2007" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:telerik="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.GridView"
             telerik:gridviewdatacolumn.header xmlns="http://schemas.microsoft.com/client/2007" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:telerik="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.GridView"
                        grid name="gdGrid4" xmlns="http://schemas.microsoft.com/client/2007" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                                <grid.rowdefinitions>
                                    rowdefinition height="20*" 
                                    rowdefinition height="1"
                                    <rowdefinition height="20*" />
                                    <rowdefinition height="1" />
                                    <rowdefinition height="20*" />
                                    <rowdefinition height="1" />
                                </grid.rowdefinitions>
                                <grid.columndefinitions>
                                    <columndefinition width="50*" />
                                    <columndefinition width="1" />
                                    <columndefinition width="50*" />
                                    <columndefinition width="1" />
                                    <columndefinition width="50*" />
                                    <columndefinition width="1" />
                                    <columndefinition width="50*" />
                                    <columndefinition width="1" />
                                    <columndefinition width="50*" />
                                    <columndefinition width="1" />
                                    <columndefinition width="50*" />
                                    <columndefinition width="1" />
                                    <columndefinition width="50*" />
                                    <columndefinition width="1" />
                                    <columndefinition width="50*" />
                                    <columndefinition width="1" />
                                    <columndefinition width="50*" />
                                    <columndefinition width="1" />
                                </grid.columndefinitions>
                                <contentpresenter content="2013电量报表" verticalalignment="Center" horizontalalignment="Center" grid.columnspan="18" />
                                <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" height="1" visibility="Visible" grid.row="1" grid.columnspan="18" />
                                <contentpresenter content="用户单位：阿迪锅" grid.row="2" verticalalignment="Center" horizontalalignment="Center" grid.columnspan="4" grid.column="0" />
                                <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" width="1" visibility="Visible" grid.row="4" grid.column="1" />
                                <contentpresenter content="能源类型：用电" grid.row="2" verticalalignment="Center" horizontalalignment="Center" grid.columnspan="4" grid.column="6" />
                                <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" width="1" visibility="Visible" grid.row="4" grid.column="3" />
                                <contentpresenter content="编号：43" grid.row="2" verticalalignment="Center" horizontalalignment="Center" grid.columnspan="4" grid.column="13" />
                                <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" width="1" visibility="Visible" grid.row="4" grid.column="5" />
                                <contentpresenter content="编号" grid.row="4" verticalalignment="Center" horizontalalignment="Center" grid.column="0" />
                                <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" width="1" visibility="Visible" grid.row="4" grid.column="1" />
                                <contentpresenter content="名称" grid.row="4" verticalalignment="Center" horizontalalignment="Center" grid.column="2" />
                                <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" width="1" visibility="Visible" grid.row="4" grid.column="3" />
                                <contentpresenter content="名称" grid.row="4" verticalalignment="Center" horizontalalignment="Center" grid.column="4" />
                                <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" width="1" visibility="Visible" grid.row="4" grid.column="5" />
                                <contentpresenter content="名称" grid.row="4" verticalalignment="Center" horizontalalignment="Center" grid.column="6" />
                                <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" width="1" visibility="Visible" grid.row="4" grid.column="7" />
                                <contentpresenter content="名称" grid.row="4" verticalalignment="Center" horizontalalignment="Center" grid.column="8" />
                                <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" width="1" visibility="Visible" grid.row="4" grid.column="9" />
                                <contentpresenter content="名称" grid.row="4" verticalalignment="Center" horizontalalignment="Center" grid.column="10" />
                                <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" width="1" visibility="Visible" grid.row="4" grid.column="11" />
                                <contentpresenter content="名称" grid.row="4" verticalalignment="Center" horizontalalignment="Center" grid.column="12" />
                                <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" width="1" visibility="Visible" grid.row="4" grid.column="13" />
                                <contentpresenter content="用电量" grid.row="4" verticalalignment="Center" horizontalalignment="Center" grid.column="14" />
                                <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" width="1" visibility="Visible" grid.row="4" grid.column="15" />
                                <contentpresenter content="金额" grid.row="4" verticalalignment="Center" horizontalalignment="Center" grid.column="16" />
                                <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" width="1" visibility="Visible" grid.row="4" grid.column="17" />
                                <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" height="1" visibility="Visible" grid.row="3" grid.columnspan="18" />
                            </grid>
                        </telerik:gridviewdatacolumn.header>
                        <telerik:gridviewdatacolumn.celltemplate xmlns:telerik="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.GridView">
<datatemplate>
                                <stackpanel orientation="Horizontal">
                                    <textblock width="49" text="{Binding L,Mode=TwoWay}" textalignment="Right" />
                                    <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" width="1" height="23" visibility="Visible" />
                                    <textblock width="49" text="{Binding S,Mode=TwoWay}" textalignment="Right" />
                                    <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" width="1" height="23" visibility="Visible" />
                                    <textblock width="49" text="{Binding M,Mode=TwoWay}" textalignment="Right" />
                                    <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" width="1" height="23" visibility="Visible" />
                                    <textblock width="49" text="{Binding XL,Mode=TwoWay}" textalignment="Right" />
                                    <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" width="1" height="23" visibility="Visible" />
                                    <textblock width="49" text="{Binding XXL,Mode=TwoWay}" textalignment="Right" />
                                    <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" width="1" height="23" visibility="Visible" />
                                    <textblock width="49" text="{Binding XL3,Mode=TwoWay}" textalignment="Right" />
                                    <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" width="1" height="23" visibility="Visible" />
                                    <textblock width="49" text="{Binding XL,Mode=TwoWay}" textalignment="Right" />
                                    <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" width="1" height="23" visibility="Visible" />
                                    <textblock width="49" text="{Binding Liu,Mode=TwoWay}" textalignment="Right" />
                                    <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" width="1" height="23" visibility="Visible" />
                                    <textblock width="49" text="{Binding Yang,Mode=TwoWay}" textalignment="Right" />
                                    <rectangle fill="#FF0B1D1D" verticalalignment="Stretch" width="1" height="23" visibility="Visible" />
                                </stackpanel>
                            </datatemplate>
                        </telerik:gridviewdatacolumn.celltemplate>
                    </telerik:gridviewdatacolumn>

                </telerik:radgridview.columns>
            
    </grid>
</usercontrol>