Issue in Maui app

[MScriptGit]

Hi, I'm new to both GitHub and packages, so please bear with me.

I thought it was fun to make a MAUI app (made one before without problems) to download from YT.

My issue is this: as soon as I put the example code
`var youtube = new YoutubeClient();

// You can specify either the video URL or its ID
var videoUrl = "https://youtube.com/watch?v=u_yIGGhubZs";
var video = await youtube.Videos.GetAsync(videoUrl);

var title = video.Title; // "Collections - Blender 2.80 Fundamentals"
var author = video.Author.ChannelTitle; // "Blender"
var duration = video.Duration; // 00:07:20`

in my MainPage.xaml.cs page, I get an error message upon testrunning:

"DataTemplateExtension: Could not
locate type for local: MainPage"

When I remove or comment above code, no problem arises.
When I move the code to another page, I still get the same error.

Yes, I did declare the YoutubeExplode namespace.

I can't seem to find a solution.
I hope you guys can help me!

[MScriptGit]

For total clearness, I have the full code in a repo here: https://github.com/MScriptGit/YTDownloader