How to populate Option Menu with items in list? TypeError: __init__() missi

[Aleks_Retr0]

Hello Guys! I'm new in python and started creating this code without any experience and of course I can't know a lot about coding and I will do a lot of stupid mistakes, and this case is not exception as well.
I tried to assign option menu to my list, but I receive an error:

Traceback (most recent call last):
  File "main.py", line 91, in <module>
    app = CollegeApp()
  File "main.py", line 13, in __init__
    frame = F(self.container, self)
  File "main.py", line 70, in __init__
    self.userEntry()
  File "main.py", line 76, in userEntry
    indivSet = OptionMenu(self, self.usersInd, *Individuals)
TypeError: __init__() missing 1 required positional argument: 'value'

(And as I understood, 'value' is an item(s) that list should contain?)

The idea is that the user enters names into the Entry Widget, after which all these names are stored in the "Individuals" list. I would like these names to be displayed in the option menu and to be able to select any name from the drop-down list. It is very important that each name can be selected separately from the others, so as not to select the entire list of names.

In fact, I found instructions in Google on how to bind a list to the option menu, BUT there is one catch, in all these instructions, lists already filled with items were given as an example. In my case, the list is initially empty, but is gradually filled with new items (names) and I cannot know which items will be in the list, since each new user input will be unique.

I would like to know how you can make such a dropdown list.

My code:

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


class CollegeApp(Tk):
    def __init__(self):
        Tk.__init__(self)
        self.container = ttk.Frame(self)
        self.container.pack(side="top", fill="both", expand=True)
        self.frames = {}
        for F in (IndividPage ,counterPage):
            frame = F(self.container, self)
            self.frames[F] = frame
            frame.grid(row=0, column=0, sticky="nsew")
        self.show_frame(IndividPage)
        self.lift()

    def show_frame(self, cont):
        frame = self.frames[cont]
        frame.tkraise()


class IndividPage(ttk.Frame):

    def __init__(self, parent, controller):
        self.controller = controller
        ttk.Frame.__init__(self, parent)
        self.userEntry()

    def userEntry(self):
        headingTest = Label(self, text="Enter your UserName:", font="Arial 20")
        headingTest.grid(row=0, column=0, pady=5, padx=5)

        self.usernameEnter = Entry(self, width=40)
        self.usernameEnter.grid(row=0, column=1, padx=5, pady=5)

        confirmBtn = Button(self, text="Confirm User", font="Arial 16",
                            command=self.confirm)

        confirmBtn.config(height=4, width=12)
        confirmBtn.grid(row=2, column=2, sticky=E, padx=45, pady=360)

    def confirm(self):
        if self.add_to_indivList():
            pass

    def add_to_indivList(self):
        user = self.usernameEnter.get()
        if len(user) == 0:
            messagebox.showwarning(title='No user', message='Please enter a username!')
            return
        if self.usernameEnter.get():
            self.controller.show_frame(counterPage)

        if user in Individuals:
            messagebox.showwarning(title='In team', message=f'{user} is already in Individuals list!')

        Individuals.append(user)
        processedInd = list(dict.fromkeys(Individuals))
        self.controller.show_frame(counterPage)
        print(processedInd)
        print(len(Individuals))


class counterPage(ttk.Frame):
    def __init__(self, parent, controller):
        self.controller = controller
        ttk.Frame.__init__(self, parent)
        self.userEntry()

    def userEntry(self):

        self.usersInd = StringVar(self)
        self.usersInd.set(Individuals)
        indivSet = OptionMenu(self, self.usersInd, *Individuals)
        indivSet.grid(row=0, column=1, padx=10, pady=10)

        self.usersInd = StringVar(self)
        self.usersInd.set(Individuals)
        indivSet = OptionMenu(self, self.usersInd, *Individuals)
        indivSet.grid(row=0, column=0, padx=10, pady=10)

        backBtn = Button(self, text="BACK", font="Arial 16", height=2, width=6,
                         command=lambda: self.controller.show_frame(IndividPage))
        backBtn.grid(row=1, column=0, sticky=W, pady=245, padx=10)


if __name__ == '__main__':
    Individuals = []
    app = CollegeApp()
    app.geometry("800x500")
    app.resizable(False, False)
    app.title('Points Counter')
    app.mainloop()