[Question] FilePickerFile.__init__() missing required argument 'id' on Ubuntu 24.04

[LimaVsC]

Question

When using FilePicker with pick_files() on Ubuntu 24.04 (Flet 0.28.3), the following error occurs after selecting a file:

TypeError: FilePickerFile.__init__() missing 1 required positional argument: 'id'

Code sample

import flet as ft

def main(page: ft.Page):
    def pick_files_result(e: ft.FilePickerResultEvent):
        if e.files:
            page.add(ft.Text(", ".join(f.name for f in e.files)))
        else:
            page.add(ft.Text("Cancelled"))

    picker = ft.FilePicker(on_result=pick_files_result)
    page.overlay.append(picker)

    page.add(
        ft.ElevatedButton("Pick files", on_click=lambda _: picker.pick_files(allow_multiple=True))
    )

ft.app(target=main)

Error message

TypeError: FilePickerFile.__init__() missing 1 required positional argument: 'id'

------------------------------------------------------

• I have searched for answers to my question both in the issues and in previous discussions.

[ndonkoHenri]

#5299

I will suggest you start a new venv.

[LimaVsC]

Tried this twice. Same issue.

[LimaVsC]

Out of curiosity, I created a virtual machine and the app runs perfectly there using the same code and setup.

[LimaVsC]

How I solved it: I deleted the build folder. I think some files in there were causing a conflict.