python 3.x - Error <Class> has not attribute <method> in Tkinter -

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i trying link tkinter frame one, error

attributeerror: 'mainscreen' object has no attribute 'nextscreen'

my code below :

what meaning of error?

from tkinter import ttk tkinter import * import tkinter import imap class mainscreen():     def __init__(self,tkgui):         global w,x         self.tkgui =tkgui         tkgui.configure(background='red')         label(tkgui,text='please enter email',bg='red',fg='white').grid(row=0,column=2)         e=entry(tkgui,width=20)         e.grid(row=1,column=2)         w=e.get()         print(w)         label(tkgui,text='please enter password',bg='red',fg='white').grid(row=2,column=2)         p=entry(tkgui,width=20,show='*')         p.grid(row=3,column=2,sticky=w)         x=p.get()         button(tkgui,text="sign on").grid(row=5,column=2)         button.bind('<button>',self.nextscreen())     def nexscreen(self,event):         inboxscreen=imap.signin(w,x) tkgui=tkinter.tk() app=mainscreen(tkgui) tkgui.mainloop()

it looks though have typo. in code, function named nexscreen call nextscreen


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