Database Submit Entry Syntax Error

[Melford]

Okay so now I'm getting this error:

Error:
Traceback (most recent call last):
  File "C:\Users\jumbu\AppData\Local\Programs\Python\Python37-32\lib\tkinter\__init__.py", line 1705, in __call__
    return self.func(*args)
  File "C:/Users/jumbu/Desktop/python/test.py", line 22, in submit
    c.execute("INSERT INTO Expense_Data.db VALUES (?, ?, ?, ?)", (l1.get(), l2.get(), l3.get(), l4.get()))
AttributeError: 'Label' object has no attribute 'get'

Here's my full code although I'm not too sure if the problem is outside of that chunk I sent beforehand

from tkinter import *
import sqlite3

# Database Creation & Filename
conn = sqlite3.connect('Expense_Data.db')

# Create Cursor connecting to database
c = conn.cursor()

# Database Table Creation
'''
c.execute("""CREATE TABLE expenses   (
    name text,
    monthly_income integer,
    monthly_budget integer,
    monthly_cost_in_expenses integer
)""")
'''


def submit():
    c.execute("INSERT INTO Expense_Data.db VALUES (?, ?, ?, ?)", (l1.get(), l2.get(), l3.get(), l4.get()))
    c.execute("INSERT INTO Expense_Data.db VALUES (?, ?, ?, ?)")


# Finalise || Commit Changes
conn.commit()

# Create Window Object
window = Tk()

# Define table contents (each row/column)
l1 = Label(window, text="Name")
l1.grid(row=0, column=0)

l2 = Label(window, text="Monthly Income")
l2.grid(row=1, column=0)

l3 = Label(window, text="Monthly Budget")
l3.grid(row=2, column=0)

l4 = Label(window, text="Monthly Expenses")
l4.grid(row=3, column=0)

# Define Entries
name_text = StringVar()
e1 = Entry(window, textvariable=name_text)
e1.grid(row=0, column=1)

Monthly_Income_text = StringVar()
e2 = Entry(window, textvariable=Monthly_Income_text)
e2.grid(row=1, column=1)

Monthly_Budget = StringVar()
e3 = Entry(window, textvariable=Monthly_Budget)
e3.grid(row=2, column=1)

Monthly_Expenses = StringVar()
e4 = Entry(window, textvariable=Monthly_Expenses)
e4.grid(row=3, column=1)

# Define ListBox
list1 = Listbox(window, height=6, width=35)  # check this
list1.grid(row=5, column=0, columnspan=2)

# Attach scrollbar to the list
sb1 = Scrollbar(window)
sb1.grid(row=2, column=2, rowspan=6)

list1.configure(yscrollcommand=sb1.set)
sb1.configure(command=list1.yview)

# Define buttons
b1 = Button(window, text="View All", width=12)
b1.grid(row=2, column=3)

b2 = Button(window, text="Search Entry", width=12)
b2.grid(row=3, column=3)

b3 = Button(window, text="Add Entry", width=12)
b3.grid(row=4, column=3)

b4 = Button(window, text="Update Selected", width=12, command=submit)
b4.grid(row=5, column=3)

b5 = Button(window, text="Delete Selected", width=12)
b5.grid(row=6, column=3)

b6 = Button(window, text="Close", width=12)
b6.grid(row=7, column=3)
submit_btn = Button(text="Add Record to Database", command=submit)
submit_btn.grid(row=6, column=0, columnspan=2,)
window.mainloop()