My button is not appearing on my Tkinter project

Why isn’t my button showing up on my Tkinter project?

def mainMenu():
    window = tk.Tk()
    window.title("Main Menu")
    window.geometry("400x400")
    window.rowconfigure(0, minsize=200, weight=1)
    window.columnconfigure(1, minsize=200, weight=1)
    
    buttonsFrame = tk.Frame(master=window)
    
    POSBtn = tk.Button(master=buttonsFrame, text="POS", bg="red")
    POSBtn.place(x=200,y=200, width=250,height=250)


    buttonsFrame.grid(row=0,column=0,sticky="nsew")
    window.mainloop()

if __name__ == "__main__":
    mainMenu()

>Solution :

You have a problem with your grid, try this:

Change window.columnconfigure(1, minsize=200, weight=1) to window.columnconfigure(0, minsize=200, weight=1)

or if you need columnconfigure as 1 then

Change buttonsFrame.grid(row=0,column=0,sticky="nsew") to buttonsFrame.grid(row=0,column=1,sticky="nsew")