[Python] How can I make a checklist with checkboxes?

I'm trying to make a checklist with checkboxes that I can click by clicking the checkboxes.

I tried some code from How to create Checkboxes from list, but it gives me an error. I know how to code some basic programs, but not more complex ones. This is my code:

import tkinter as tk

class CheckbuttonList(tk.LabelFrame):
def __init__(self, master, text=None, list_of_cb=None):
super().__init__(master)

self['text'] = text
self.list_of_cb = list_of_cb
self.cb_values = dict()
self.check_buttons = dict()

if self.list_of_cb:
for item in list_of_cb:
self.cb_values[item] = tk.BooleanVar()
self.check_buttons[item] = tk.Checkbutton(self, text=item)
self.check_buttons[item].config(onvalue=True, offvalue=False,
variable=self.cb_values[item])
self.check_buttons[item].pack()



if __name__ == '__main__':

root = tk.Tk()

my_list = ["item1", "item2", "item3"]

my_cbs = CheckbuttonList(root, "My Checkbox List", my_list)
my_cbs.pack()

root.mainloop()


This is the error I keep getting:

Traceback (most recent call last): File "/home/main.py", line 24, in root = tk.Tk() File "/usr/lib/python3.10/tkinter/init.py", line 2299, in init self.tk = _tkinter.create(screenName, baseName, className, interactive, wantobjects, useTk, sync, use) _tkinter.TclError: couldn't connect to display ":1"
​

BTW I'm using an online compiler to test this, but I used the python program as well and got the same error.

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