Unhandled exception | Linux Debian 13

[XZY123lol]

Unhandled exception. System.Exception: XOpenDisplay failed
   at Avalonia.X11.AvaloniaX11Platform.Initialize(X11PlatformOptions options)
   at Avalonia.AppBuilder.SetupUnsafe()
   at Avalonia.ClassicDesktopStyleApplicationLifetimeExtensions.StartWithClassicDesktopLifetime(AppBuilder builder, String[] args, ShutdownMode shutdownMode)
   at HolyClient.Desktop.Program.Main(String[] args)
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