PermissionError Errno 13 Permission denied

Question

This is the code :

def download():
    # get selected line index
    index = films_list.curselection()[0]
    # get the line's text
    selected_text = films_list.get(index)
    directory = filedialog.askdirectory(parent=root, 
                                        title="Choose where to save your movie")
    place_to_save = directory + '/' + selected_text
    print(directory, selected_text, place_to_save)
    with open(place_to_save, 'wb') as file:
        connect.retrbinary('RETR ' + selected_text, file.write)
    tk.messagebox.showwarning('File downloaded', 
                              'Your movie has been successfully downloaded!' 

But when I run this code I am getting this error:

Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Python34\lib\tkinter\__init__.py", line 1538, in __call__
return self.func(*args)
File "C:/Users/Marc/Documents/Programmation/Python/Llamachat/Llamachat/Llamachat.py", line 32, in download
with open(place_to_save, 'wb') as file:
PermissionError: [Errno 13] Permission denied: '/goodbye.txt'

How can I fix this error?