[Python] Tkinter, unable to disable/enable widget using the code from a tutorial [duplicate]

I am using the following code (from a youtube tutorial) to enable and disable a widget in a tkinter window.

However, I'm not getting the expected result. I am expecting the text widget to enable on the button click, but it starts as disabled and won't allow it to be enabled.

What am I doing wrong?

import tkinter as tk
from tkinter import ttk

class MainWindow(tk.Tk):
def __init__(self):
super().__init__()
self.style = ttk.Style()
self.create_main_frame().pack(expand=True)

def on_enable_button_clicked(self):
self.lbl_welcome.state(["!disabled"])

def on_disable_button_clicked(self):
self.lbl_welcome.state(["disabled"])

def create_main_frame(self):
frame_main = ttk.Frame(self)
self.lbl_welcome = ttk.Label(frame_main,text="Testing")
btn_enable = ttk.Button(frame_main,text="enable",command=self.on_enable_button_clicked())
btn_disable = ttk.Button(frame_main,text="disable",command=self.on_disable_button_clicked())
self.lbl_welcome.grid(row=0, column=0, columnspan=2)
btn_enable.grid(row=1,column=0,padx=2,pady=(10,0))
btn_disable.grid(row=1,column=1,padx=2,pady=(10,0))
return frame_main

def main():
main_window = MainWindow()
main_window.geometry("450x400")
main_window.mainloop()

if __name__ == "__main__":
main()

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