I have started working with tkinter and I have such problems. For example,
from tkinter import *
root = Tk()
frame = Frame(root)
frame.pack()
theLabel = Label(root, text="bla bla")
theLabel.grid(row=0)
root.mainloop()
This code does not work and gives an error like that.
File "C:\Users\Kenan\AppData\Local\Programs\Python\Python35-32\lib\tkinter\__init__.py", line 2074, in grid_configure
+ self._options(cnf, kw))
_tkinter.TclError: cannot use geometry manager grid inside . which already has slaves managed by pack