I keep receiving The parameter is incorrect. Assets/Fonts/Segoe UI.otf is not a valid absolute URI. on Maui WinUI app

Question

I keep receiving The parameter is incorrect. Assets/Fonts/Segoe UI.otf is not a valid absolute URI. on Maui WinUI app

Hristov, Marian 0

I keep receiving The parameter is incorrect. Assets/Fonts/Segoe UI.otf is not a valid absolute URI. on Maui WinUI app, eventhough I don't use this font anywhere and only Sentry seems to find this error. However this error occurs constantly and potentially take my sentry limit.

Moose 0 Reputation points

2025-05-30T14:22:21.2366667+00:00

I'm getting the same in my MAUI app... are you using syncfusion controls?
Moose 0 Reputation points

2025-07-02T10:06:45.6233333+00:00

yes, I'm using syncfusion controls

1 answer

Your answer

Moose 0 Reputation points

2025-05-30T14:22:21.2366667+00:00

I'm getting the same in my MAUI app... are you using syncfusion controls?
Moose 0 Reputation points

2025-07-02T10:06:45.6233333+00:00

yes, I'm using syncfusion controls

Answer 1

Harry Vo (WICLOUD CORPORATION) 1,315 Microsoft External Staff

Hi @Hristov, Marian thank you for reaching out on Microsoft Q&A!

Even though you didn't use this font anywhere, it worth a try to check by searching it using short-cut Ctrl + Shift + F and find Segoe UI. You might accidentally use this font as FontFamily = "SegoeUI"

Also, please double check if you had defined this font in MauiProgram.cs / MauiApp.xaml.cs / App.xaml / App.xaml.cs. It can also be defined in Style or control template so please check them too.

You can also fix this issue by install that font - Segoe UI.otf - to the URI Assets/Fonts/

I hope this helps you get things back on track quickly! If my suggestions can solve your issue, feel free to interact with the system accordingly!

Thank you!

FlamingFury 0 Reputation points

2025-08-26T18:45:21.0366667+00:00

I am having the same issue and no, the term Segoe is nowhere used in the project. but adding it manuallly fixed it.
Harry Vo (WICLOUD CORPORATION) 1,315 Reputation points Microsoft External Staff

2025-08-27T02:38:09.3766667+00:00

Hi @FlamingFury , I'm glad you finally solve your issue!

If your project doesn't use that font, there's a chance that some third-party UI library, Native WinUI controls, ... using it!

The easiest fix for now is to just install the font manually—it’ll get your project running smoothly and make sure all the libraries work like they should!
Harry Vo (WICLOUD CORPORATION) 1,315 Reputation points Microsoft External Staff

2025-08-28T07:32:16.1666667+00:00

Hi @Hristov, Marian , have you solved your issue? Let me know if you have any question! Thank you!

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I keep receiving The parameter is incorrect. Assets/Fonts/Segoe UI.otf is not a valid absolute URI. on Maui WinUI app

1 answer

Your answer