'StringVar' obj is not callable - string

Question

it said the stringvar obj is not callable? i dont know how to fix this can someone help me. thanks
import sqlite3
from tkinter import *
from tkinter import messagebox
i use self.Username etc with a first letter capslock so i can pass it on database connection but it said that stringvar is not callable.
class register:
def __init__(self, window):
self.Username = StringVar()
self.Password = StringVar()
self.Confirm_Password = StringVar()
self.Fullname = StringVar()
self.window = window
self.window.geometry('500x200')
window.resizable(0, 0)
window.configure(bg="deep sky blue")
window.title("Register")
l1 = Label(self.window, text="Username:", font=("Arial", 15), bg="deep sky blue")
l1.place(x=10, y=10)
self.fullname = Entry(self.window, width=30, bd=5, textvariable=self.Fullname)
self.fullname.place(x=200, y=10)
l1 = Label(self.window, text="Username:", font=("Arial", 15), bg="deep sky blue")
l1.place(x=10, y=60)
self.username = Entry(self.window, width=30, bd=5, textvariable=self.Username)
self.username.place(x=200, y=60)
l2 = Label(self.window, text="Password:", font=("Arial", 15), bg="deep sky blue")
l2.place(x=10, y=110)
self.password = Entry(self.window, width=30, show="*", bd=5, textvariable=self.Password)
self.password.place(x=200, y=110)
l3 = Label(self.window, text="Confirm Password:", font=("Arial", 15), bg="deep sky blue")
l3.place(x=10, y=170)
self.confirm_password = Entry(self.window, width=30, show="*", bd=5, textvariable=self.Confirm_Password)
self.confirm_password.place(x=200, y=170)
b1 = Button(self.window, text="Sign in", font=("Arial", 15), bg="#ffc22a", command=self.submit)
b1.place(x=170, y=150)
b2 = Button(self.window, text="Back", font=("Arial", 15), bg="#ffc22a", command=self.submit)
b2.place(x=250, y=150)
heres how i pass it did i make mistake on passing the variable?
connection = sqlite3.connect('RegLog.db')
cur = connection.cursor()
cur.execute("CREATE TABLE IF NOT EXISTS RegLog( username TEXT, Password TEXT, "
"ConfirmPassword TEXT)")
connection.commit()
connection.close()
def submit(self):
check_counter = 0
warn = ""
if self.fullname.get() == "":
warn = "Full Name can't be empty"
else:
check_counter += 1
if self.username.get() == "":
warn = "Full Name can't be empty"
else:
check_counter += 1
if self.password.get() == "":
warn = "Email Field can't be empty"
else:
check_counter += 1
if self.confirm_password.get() == "":
warn = "Sorry, can't sign up make sure all fields are complete"
else:
check_counter += 1
if self.password.get() != self.confirm_password.get():
warn = "Passwords didn't match!"
if check_counter == 4:
try:
connection = sqlite3.connect("RegLog.db")
cur = connection.cursor()
cur.execute("INSERT INTO RegLog values(?,?,?)",
(self.Username.get(), self.Password.get(), self.Confirm_Password.get(), self.Fullname()))
connection.commit()
connection.close()
messagebox.showinfo("Success", "New account created successfully")
and also i think this exception is thrown whenever run the program.it said expected type 'str|None',got 'Exception' instead
except Exception as ep:
messagebox.showerror('Error1', ep)
else:
messagebox.showerror('Error', warn)
def page():
window = Tk()
register(window)
window.mainloop()