Fix for "TclError: can't invoke "button" command"?

I’m attempting tkinter in python for the first time but the Button command creates an error

from tkinter import *
fenetre=Tk()
label=Label(fenetre,text="Hello World ! ")
label.pack() 
fenetre.mainloop()
bouton=Button(fenetre,text="fermer", command=fenetre.quit)
boutoun.pack()

It should create a window with a button but I just receive the error message:

---------------------------------------------------------------------------
TclError                                  Traceback (most recent call last)
<ipython-input-21-fd57f3be1272> in <module>
----> 1 bouton=Button(fenetre,text="Exit !", command=fenetre.quit)
      2 boutoun.pack()

~\anaconda3\lib\tkinter\__init__.py in __init__(self, master, cnf, **kw)
   2648             overrelief, state, width
   2649         """
-> 2650         Widget.__init__(self, master, 'button', cnf, kw)
   2651 
   2652     def flash(self):

~\anaconda3\lib\tkinter\__init__.py in __init__(self, master, widgetName, cnf, kw, extra)
   2570         for k, v in classes:
   2571             del cnf[k]
-> 2572         self.tk.call(
   2573             (widgetName, self._w) + extra + self._options(cnf))
   2574         for k, v in classes:

TclError: can't invoke "button" command: application has been destroyed```
There's some similar questions in the forum but unfortunately they do not work for me.

>Solution :

The correct code is:

from tkinter import *
fenetre=Tk()
label=Label(fenetre,text="Hello World ! ")
label.pack() 
bouton=Button(fenetre,text="fermer", command=fenetre.destroy)  # HERE (1)
bouton.pack()
fenetre.mainloop()  # HERE (2)

1. Use fenetre.destroy instead of fenetre.quit
2. The main loop should be the last line to catch events (to be simple)