TypeError: keys must be str, int, float, bool or None, not MaterialState

[Isnaeni2003]

how to solve it?
error message:
TypeError: keys must be str, int, float, bool or None, not MaterialState

my code :

import flet as ft
from flet import colors
def main(page: ft.Page):
    page.title = "Elevated button with 'click' event"

    def button_clicked(e):
        b.data += 1
        t.value = f"Button clicked {b.data} time(s)"
        page.update()

    b = ft.ElevatedButton("Button with 'click' event", 
    	style=ft.ButtonStyle(
    		color={
    		ft.MaterialState.HOVERED:colors.RED,
    		  ft.MaterialState.FOCUSED: ft.colors.BLUE,
                    ft.MaterialState.DEFAULT: ft.colors.BLACK,
    		}
    	),

    	on_click=button_clicked, data=0)
    t = ft.Text()

    page.add(b, t)

ft.app(target=main)

[Francois-Belanger]

#765