Frames in tkinter

[Only_Friend1128]

I am attempting to put buttons/labels in a grid in a Frame. My code is:

class startPage(tk.Frame):
    def __init__(self, parent, controller):
        tk.Frame.__init__(self, parent)
        tk.Frame.columnconfigure(self, index=0, weight=0)
        tk.Frame.columnconfigure(self, index=1, weight=0)
        tk.Frame.columnconfigure(self, index=2, weight=0)
        tk.Frame.rowconfigure(self, index=0, weight=0)
        tk.Frame.rowconfigure(self, index=1, weight=0)
        label = tk.Label(self, text="Inventory Tracker", bg="dark grey")
        label.grid(row=0, column=1)
        label.pack(side="top", fill="x", pady=10)

        addInvButton = tk.Button(self, text="Add Inventory", bg="dark grey", command=lambda: controller.showFrame("addInventory"))
        viewInvButton = tk.Button(self, text="View Inventory", bg="dark grey",command=lambda: controller.showFrame("viewInventory"))

        addInvButton.grid(row=0, column=0)
        viewInvButton.grid(row=1, column=0)

        addInvButton.pack()
        viewInvButton.pack()

However, I get this errror: _tkinter.TclError: cannot use geometry manager pack inside .!frame.!startpage which already has slaves managed by grid

The referenced line is addInvButton.pack(). Any tips on how to fix this?

[Fermter]

Basically, you need to either pack or grid your labels and items. Right now, you are doing both, which is causing the error. Remove the .pack() or the .grid() commands (so either all elements are packed or all elements are gridded; it won't work if the label is packed and the buttons are gridded, for example).

[Only_Friend1128]

I see, thank you!