Get Exception While Add RadRichTextBox ?

[Ravi]

Hello World 

I am getting an exception when i am trying to use RadRichTextBox. Control is added to page successfully but when i am trying to load my page it gives me an exception

Code : 4004
Category : ManagedRuntimeError
Message : System.TypeInitizlizationException : The Type initializer for 'Telerik.Windows.Document.UI.Extensibility.RadCompositionInitizlizer' threw..

it opens the VS debugger 

please let me know how the solve this kind of prob ASAP. my xaml code is

<navigation:Page x:Class="PracticeAssignments.Home"
    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"
    xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
    xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
    xmlns:telerikWindowsControls="clr-namespace:Telerik.Windows;assembly=Telerik.Windows.Controls"
    xmlns:telerikDocuments="clr-namespace:System;assembly=Telerik.Windows.Documents"
    xmlns:telerikData="clr-namespace:Telerik.Windows.Data;assembly=Telerik.Windows.Data"
    xmlns:telerikInput="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Input"
    xmlns:telerikRichTextBoxCommands="clr-namespace:Telerik.Windows.Documents.RichTextBoxCommands;assembly=Telerik.Windows.Documents"
    xmlns:telerikRichTextBoxUI="clr-namespace:Telerik.Windows.Controls.RichTextBoxUI;assembly=Telerik.Windows.Controls.RichTextBoxUI"
    xmlns:telerikFormatProRTF="clr-namespace:Telerik.Windows.Documents.FormatProviders.Rtf;assembly=Telerik.Windows.Documents"

    mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480"
    Title="Home"
    Style="{StaticResource PageStyle}">

    <Grid x:Name="LayoutRoot">
        <ScrollViewer x:Name="PageScrollViewer" Style="{StaticResource PageScrollViewerStyle}" Margin="-54,-8,-62,-22">
            <StackPanel x:Name="ContentStackPanel" VerticalAlignment="Center">
                <telerik:RadRichTextBox VerticalAlignment="Center" HorizontalAlignment="Center" Width="200"></telerik:RadRichTextBox>
            </StackPanel>
        </ScrollViewer>
    </Grid>

</navigation:Page>

[Martin Ivanov]

Hello Ravi,

The problem is probably due to a missing reference or wrong version of an assembly.
Please check those, try deleting bin, obj and rebuilding. A list of all required assembly references can be found here.
Hope this helps you. 

Regards,
Martin
the Telerik team

[Jose]

I am encountering a similar error for a wpf application that supports netcoreapp3.1 and net472.  It works when running under net472(Telerik version: 2017.1.222.45) but fails when running necoreapp3.1(Telerik version: 2020.1.218.310).  I removed the bin and obj folders and rebuilt but the error is still there.  

System.Windows.Markup.XamlParseException
  HResult=0x80131501
  Message='Initialization of 'Telerik.Windows.Controls.RadComboBox' threw an exception.' Line number '419' and line position '10'.
  Source=PresentationFramework

[Dimitar]

Hi Jose,

It seems that the references are missing and the control cannot be initialized. Please note that we have a separate set of assemblies for .NET Core. Make sure that the correct assemblies are referenced in your project. The assemblies for net core are located in the following folder: C:\Program Files (x86)\Progress\Telerik UI for WPF R1 2020\Binaries\NetCore. In addition, their version ends with 310.

I hope this helps. Should you have any other questions do not hesitate to ask.

Regards,
Dimitar
Progress Telerik