[Tkinter] Notebook accessing a specific tab using a button from a toplevel frame

[honestie]

Thank you, This is now the new error:
line 892, in select
return self.tk.call(self._w, "select", tab_id)
_tkinter.TclError: bad command "select": must be configure, cget, instate, state, or identify

If tried to replace it with "configure" and state "state", it gives no error but doesnt work when the button is clicked.

With cget, instate and identify i dont know what the other arguemnts would be.
I am using python version 3.7, if that helps. Thank you again.

My Current code:

from tkinter import *
from tkinter import ttk
import tkinter.messagebox
import tkinter as tk


class Root(Tk):
    def __init__(self):
        super(Root, self).__init__()
        self.title("Application")
        self.minsize(640, 400)
        self.configure(background="white")

        self.createMenu()

        tabControl = ttk.Notebook(self)
        self.tab1 = ttk.Frame(tabControl)
        tabControl.add(self.tab1, text="tab 1")


        self.tab2 = ttk.Frame(tabControl)
        tabControl.add(self.tab2, text="tab 2")

        self.tab3 = ttk.Frame(tabControl)
        tabControl.add(self.tab3, text="tab 3")

        self.tab4 = ttk.Frame(tabControl)
        tabControl.add(self.tab4, text="tab 4")
        self.addingTab4()

        self.tab5 = ttk.Frame(tabControl)
        tabControl.add(self.tab5, text="tab 5")


        self.tab6 = ttk.Frame(tabControl)
        tabControl.add(self.tab6, text="tab 6")


        self.tab7 = ttk.Frame(tabControl)
        tabControl.add(self.tab7, text="Tab 7")

        tabControl.pack(expand=1, fill="both")

    def startpressed(self):
        new = tk.Toplevel(self)
        new.minsize(640, 400)
        new.geometry('500x300')
        new.configure(background="white")
       # tabControl1 = ttk.Notebook(new)
        #new.tab1 = ttk.Frame(tabControl1)
        #tabControl1.add(new.tab1, text="tab 1")
        #tabControl1.pack(expand=1, fill="both")

    def createMenu(self):
        menubar = Menu(self)
        self.config(menu=menubar)

        file_menu = Menu(menubar, tearoff=0)
        menubar.add_cascade(label="File", menu=file_menu)
        file_menu.add_command(label="Exit")

        help_menu = Menu(menubar, tearoff=0)
        menubar.add_cascade(label="Help", menu=help_menu)
        help_menu.add_command(label="About Us")


    def addingTab4(self):
        Label(self.tab4, text= "Please Select your choice" ).place(x= 250, y= 20)
        submit = Button(self.tab4, text="Submit", command=lambda: self.submit()).place(x=520, y=320)


    def submit(self):
        newTop = Toplevel(self.master)
        display = Label(newTop, text="Review").pack()
        newTop.title("Review and Submit")
        newTop.focus_set()
        newTop.geometry("400x600")
        # WOULD LIKE: when this button is clicked it takes the user to tab 7 of the notebook window
        btnResult = Button(newTop, text="Tab 7",command= self.result1).pack()
        btnBack = Button(newTop, text="Back").pack()

    def result1(self):
        ttk.Notebook.select(self.tab7)

root = Root()
root.mainloop()