When compiling with Nuitka, the isatty() method of uvicorn reports an error.

[SHDocter]

use ui.run(use_colors=False) to disable check

[falkoschindler]

Thanks for sharing this workaround, @SHDocter!

For anyone landing here: when you compile a NiceGUI app with Nuitka (or similar tools like PyInstaller), the bundled sys.stdout/sys.stderr objects may lack the isatty() method that uvicorn calls to decide whether to use ANSI color codes. This causes an AttributeError at startup.

The fix is straightforward — disable colored output:

ui.run(use_colors=False)