Loading usercontrol in mainwindow

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WPF

I'm loading user control in main window of Wpf

Getting following error

"'Set connectionId threw an exception.' Line number '24' and line position '18'."}

Innner Execption
{"Unable to cast object of type 'EDIManagementModule.EDIManagementModule.EDIManagementModule.LoadInbox' to type 'EDIManagementModule.EDIManagementModule.EDIManagementModule.EDIManagementModule.LoadInbox'."}


My main window

<window x:class="MainWindow" xmlns:x="#unknown">
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:InboxTabData="clr-namespace:EDIManagementModule.EDIManagementModule.EDIManagementModule"
    Title="EDI Module"  Height="900" Width="1600" MinHeight="225"
        MinWidth="400"  WindowState="Maximized" BorderThickness="0"&gt;

    <grid>
        <tabcontrol name="tabMain" tabstripplacement="Left">
            <tabcontrol.bitmapeffect>
                <dropshadowbitmapeffect color="#bbbbbb" direction="240" />
            </tabcontrol.bitmapeffect>
            <tabitem name="tbMenu" header="MENU" isenabled="False" height="30" width="80" />
            <tabitem name="tbDashboard" height="60" width="80" removed="#dddddd">
                <tabitem.header>
                    <textblock text="Dashboard" width="70" fontsize="13" textwrapping="WrapWithOverflow" horizontalalignment="Center" textalignment="Center" verticalalignment="Center" />
                </tabitem.header>
                
            </tabitem>
            <tabitem name="tbInbox" height="60" width="80" removed="#dddddd">
                <tabitem.header>
                    <textblock text="Inbox" width="70" fontsize="13" textwrapping="WrapWithOverflow" horizontalalignment="Center" textalignment="Center" verticalalignment="Center" />
                </tabitem.header>
                <inboxtabdata:loadinbox x:name="UC_LoadInbox" xmlns:inboxtabdata="#unknown" />
            </tabitem>
        </tabcontrol>
    </grid>
</window>

Usercontrol
<usercontrol x:class="EDIManagementModule.EDIManagementModule.LoadInbox" xmlns:x="#unknown">
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             Height="400" Width="700" removed="White"&gt;
    <grid>
        <grid.columndefinitions>
            <columndefinition width="10" />
            <columndefinition width="680" />
            <columndefinition width="10" />
        </grid.columndefinitions>
        <grid.rowdefinitions>
            <rowdefinition height="20" />
            <rowdefinition height="360" />
            <rowdefinition height="20" />
        </grid.rowdefinitions>

        <stackpanel grid.row="1" grid.column="1" name="stpProgress" horizontalalignment="Center" verticalalignment="Center" orientation="Vertical">
            <stackpanel margin="10"></stackpanel>
            &lt;Button Name="btnLoad" Width="260" Height="28" Content="Load Products Data" FontSize="14"/&gt;
            <stackpanel margin="10"></stackpanel>
            <progressbar height="28" name="ProgressBar" width="700" />
            &lt;Label Content="" Foreground="Black" Visibility="Hidden" HorizontalContentAlignment="Center"  Height="26" Name="lblProgress"/&gt;
        </stackpanel>

    </grid>
</usercontrol>

What I have tried:

I'm new to wpf. Tried of changing the namespace and rebuild the project again.