Threw error when lauch markdownpad2

Question

Threw error when lauch markdownpad2

houzer 0

System: windows 11

Exception Information:

System.Windows.Markup.XamlParseException: The invocation of the constructor on type 'MarkdownPad2.UserControls.MarkdownEditor' that matches the specified binding constraints threw an exception. ---> System.InvalidCastException: Specified cast is not valid.

at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)

at Microsoft.ClearScript.Util.RawCOMHelpers.QueryInterfaceT

at Microsoft.ClearScript.Windows.ActiveScriptWrapper32..ctor(String progID, WindowsScriptEngineFlags flags)

at Microsoft.ClearScript.Windows.ActiveScriptWrapper.Create(String progID, WindowsScriptEngineFlags flags)

at Microsoft.ClearScript.Windows.WindowsScriptEngine.<>c__DisplayClass2.<.ctor>b__0()

at Microsoft.ClearScript.ScriptEngine.ScriptInvokeT

at Microsoft.ClearScript.Windows.WindowsScriptEngine..ctor(String progID, String name, WindowsScriptEngineFlags flags)

at Microsoft.ClearScript.Windows.JScriptEngine..ctor(String progID, String name, WindowsScriptEngineFlags flags)

at Microsoft.ClearScript.Windows.JScriptEngine..ctor(String name, WindowsScriptEngineFlags flags)

at MarkdownPad2.Markdown.GitHubFlavoredMarkdownOffline..ctor()

at MarkdownPad2.Markdown.MarkdownProcessorProvider.get_MarkdownProcessorMap()

at MarkdownPad2.UserControls.MarkdownEditor.SetMarkdownProcessor(MarkdownProcessorType processor)

at MarkdownPad2.UserControls.MarkdownEditor.LoadEditorSettings()

at MarkdownPad2.UserControls.MarkdownEditor..ctor()

--- End of inner exception stack trace ---

at System.Windows.Markup.WpfXamlLoader.Load(XamlReader xamlReader, IXamlObjectWriterFactory writerFactory, Boolean skipJournaledProperties, Object rootObject, XamlObjectWriterSettings settings, Uri baseUri)

at System.Windows.Markup.WpfXamlLoader.LoadBaml(XamlReader xamlReader, Boolean skipJournaledProperties, Object rootObject, XamlAccessLevel accessLevel, Uri baseUri)

at System.Windows.Markup.XamlReader.LoadBaml(Stream stream, ParserContext parserContext, Object parent, Boolean closeStream)

at System.Windows.Application.LoadBamlStreamWithSyncInfo(Stream stream, ParserContext pc)

at System.Windows.Application.LoadComponent(Uri resourceLocator, Boolean bSkipJournaledProperties)

at System.Windows.Application.DoStartup()

at System.Windows.Application.<.ctor>b__1_0(Object unused)

at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)

at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

Viorel 127.3K Reputation points

2026-01-19T03:58:05.0866667+00:00

Is it a third-party program or control?
houzer 0 Reputation points

2026-01-19T06:06:58.7566667+00:00

It's a third-party program.

And I find another link that maybe a similar issue with me: https://learn.microsoft.com/en-us/answers/questions/2202687/win11-update
Viorel 127.3K Reputation points

2026-01-19T07:47:53.12+00:00

The author should be contacted.

2 answers

Your answer

Viorel 127.3K Reputation points

2026-01-19T03:58:05.0866667+00:00

Is it a third-party program or control?
houzer 0 Reputation points

2026-01-19T06:06:58.7566667+00:00

It's a third-party program.

And I find another link that maybe a similar issue with me: https://learn.microsoft.com/en-us/answers/questions/2202687/win11-update
Viorel 127.3K Reputation points

2026-01-19T07:47:53.12+00:00

The author should be contacted.

Answer 1

The error you are encountering when launching MarkdownPad2 appears to be a XamlParseException, which indicates that there was an issue during the parsing of XAML related to the MarkdownEditor control. The inner exception, InvalidCastException, suggests that there is a problem with type casting, specifically when trying to create an instance of the ActiveScriptWrapper32 class from the ClearScript library.

Here are a few steps you can take to troubleshoot this issue:

Check Dependencies: Ensure that all necessary dependencies for MarkdownPad2, including the ClearScript library, are correctly installed and compatible with your version of Windows 11.
Update MarkdownPad2: Make sure you are using the latest version of MarkdownPad2, as updates may contain fixes for compatibility issues with newer operating systems.
Run as Administrator: Sometimes, running the application with elevated permissions can resolve issues related to COM components.
Reinstall the Application: If the problem persists, consider uninstalling and then reinstalling MarkdownPad2 to ensure a clean installation.
Check for .NET Framework Issues: Since MarkdownPad2 is built on .NET, ensure that your .NET Framework is up to date and properly configured.

If these steps do not resolve the issue, you may need to contact the support for MarkdownPad2 or check their forums for similar issues reported by other users.

Answer 2

Varsha Dundigalla(INFOSYS LIMITED) 5,185 Microsoft External Staff

Thank you for reaching out.
This issue is related to MarkdownPad 2, which is a third‑party application. Based on the error details and similar reports, the failure occurs within the application’s internal editor components, which are no longer fully compatible with recent Windows 11 updates.

Since this behavior originates from the third‑party tool itself, the resolution would need to come from the application author or vendor. We recommend reaching out to them for further guidance or updates.

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