Хорошо, но отсюда вытекло
line 142
app = ManageApp(root)
^^^^^^^^^^^^^^^
line 11, in __init__
self.create_table()
line 27, in create_table
cursor.execute('''CREATE TABLE IF NOT EXSISTS employees (
sqlite3.OperationalError: near "EXSISTS": syntax error
line 142
app = ManageApp(root)
^^^^^^^^^^^^^^^
line 11, in __init__
self.create_table()
line 27, in create_table
cursor.execute('''CREATE TABLE IF NOT EXSISTS employees (
sqlite3.OperationalError: near "EXSISTS": syntax error