pyglet causes askdirectory dialog to not open about customtkinter HOT 7 CLOSED

        from tkinter.constants import CENTER, LEFT
        import tkinter
        import tkinter.messagebox
        from tkinter import filedialog as fd 
        import customtkinter  # <- import the CustomTkinter module
        import os

        class App(customtkinter.CTk):
            customtkinter.set_appearance_mode("dark")
            APP_NAME = "Bulk Barcode Generator"
            WIDTH = 600
            HEIGHT = 450

            MAIN_COLOR = "#5ea886"
            MAIN_COLOR_DARK = "#2D5862"
            MAIN_HOVER = "#05f4b7"


            def __init__(self, *args, **kwargs):
                super().__init__(*args, **kwargs)

                self.title(App.APP_NAME)
                self.geometry(str(App.WIDTH) + "x" + str(App.HEIGHT))
                self.minsize(App.WIDTH, App.HEIGHT)

                self.protocol("WM_DELETE_WINDOW", self.on_closing)
                # ============ create two CTkFrames ============

                #1
                self.frame_left = customtkinter.CTkFrame(master=self,
                                                        width=220,
                                                        height=App.HEIGHT-40,
                                                        corner_radius=5)
                self.frame_left.place(relx=0.38, rely=0.5, anchor=tkinter.E)

                #2
                self.frame_right = customtkinter.CTkFrame(master=self,
                                                        width=350,
                                                        height=App.HEIGHT-40,
                                                        corner_radius=5)
                self.frame_right.place(relx=0.40, rely=0.5, anchor=tkinter.W)

        #        # ============ frame_right ============

                self.button_output = customtkinter.CTkButton(master=self.frame_right, border_color=App.MAIN_COLOR,
                                                        fg_color=None, hover_color=App.MAIN_HOVER,
                                                        height=28, text="Output Folder", command=self.button_outputFunc,
                                                        border_width=3, corner_radius=10, text_font=('Calibri',16))
                self.button_output.place(relx=0.05, rely=0.06, anchor=tkinter.NW)
                self.entry_output = customtkinter.CTkEntry(master=self.frame_right, width=320, height=38, corner_radius=5)
                self.entry_output.place(relx=0.05, rely=0.18, anchor=tkinter.NW)


            def button_outputFunc(self):
                self.entry_output.delete(0, 'end')
                filename = fd.askdirectory()
                self.entry_output.insert(0,str(filename))
                pass

            def on_closing(self, event=0):
                self.destroy()

            def start(self):
                self.mainloop()




        if __name__ == "__main__":
            app = App()
            app.start()