[Tkinter] Using tkinter in Spyder

[Mocap]

tkinter isn't working on Spyder for some reason. do I have to uninstall it?

import tkinter as tkr

tk = tkr.Tk()
canvas = tkr.Canvas(tk, width=500, height=500)
canvas.grid()
tk.mainloop()

def donothing():
    filewin = Toplevel(root)
    button = Button(filewin, text="Do nothing")

The last two lines have the yellow triangle with the exclamation mark, indicating some kind of an undefined root.

I had a normal terminal that was not an IDE and everything was working fine, but now it's not working..