Xaml error..?

in continuation to my previous post about starting to learn WPF, I have created a small form which works fine inside VS but gives me a error through RPS Py revit .

Although I knew that non dynamo stuffs are not entertained in this forum, I believe this may be used inside of dynamo as well with little tweaks so request to kindly bear with this.

Sorry forgot add this that It worked fine without any content after removing this line from xaml

It might be the indentation of your code-behind which looks incorrect, specifically the button click event method and its statement body - the code itself appears to be fine.

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yea…! now works fine…! thanks