为什么eror带有，无法打印按钮messagebox？

Question

我写了一些代码来了解tkinter

这是我的代码：

from tkinter import *

from tkinter import messagebox

window = Tk()
window.title('Aplikasi saya')
window.geometry('600x500')

#label
L1 = Label(window, text='Silahkan input nama ', font=('Arial bold',12))
L1.grid(column=0, row=0)

txt1 = Entry(window, width=30)
txt1.grid(column=1, row=0)

def GreetUser():
    userName = txt.get()
    messagebox.showinfo("Learning", "Hello " + userName)

btn = Button(window, text="Submit", width=15, bg="darkgrey", fg="blue", command=GreetUser)
btn.grid(column=2, row=0)

window.mainloop()

当我运行它时，我得到了以下错误

Answer 1

代码运行正常，没有任何错误。我想您可能需要重新安装tkinter，或者可能是ide的问题，因为我在python终端中编写代码时，它也运行正常

from tkinter import *

from tkinter import messagebox

window = Tk()
window.title('Aplikasi saya')
window.geometry('600x500')

#label
L1 = Label(window, text='Silahkan input nama ', font=('Arial bold',12))
L1.grid(column=0, row=0)

txt1 = Entry(window, width=30)
txt1.grid(column=1, row=0)

def GreetUser():
    userName = txt1.get()
    messagebox.showinfo("Learning", "Hello " + userName)

btn = Button(window, text="Submit", width=15, bg="darkgrey", fg="blue", command=GreetUser)
btn.grid(column=2, row=0)

window.mainloop()