import tkinter as tk
from urllib.request import urlopen

root=tk.Tk()

pagestuff=[]

pagestuff.append(tk.Label(root, text="This is a test."))

for i in pagestuff:
    i.pack(anchor=tk.NW)

def goto():
    global pagestuff
    for i in pagestuff:
        i.pack_forget()
        i.destroy()
        del i
    for i in str(urlopen(address.get()).read()).split("\n"):
        if i.startswith("h1>"):
            pagestuff.append(tk.Label(root, text=i[2:], font="Helvetica 15"))
        elif i.startswith("p>"):
            pagestuff.append(tk.Label(root, text=i[1:]))
    for i in pagestuff:
        i.pack()

address=tk.Entry(root)
goto=tk.Button(root, text="Go To", command=goto)

address.pack()
goto.pack()

tk.mainloop()

Error:
Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Users\mjmin\AppData\Local\Programs\Python\Python38-32\lib\tkinter\__init__.py", line 1883, in __call__
    return self.func(*args)
  File "D:\browse\actualthing.py", line 25, in goto
    i.pack()
  File "C:\Users\mjmin\AppData\Local\Programs\Python\Python38-32\lib\tkinter\__init__.py", line 2387, in pack_configure
    self.tk.call(
_tkinter.TclError: bad window path name ".!label"