Invalid command name error after destroying window in Tkinter - python-3.x

Question

I am using CustomTkinter Ui library to create my school project. I have a login system that destroys the current window and creates a new window when the login is successful. However, it gives the following error.
invalid command name "140374651695040check_dpi_scaling"
while executing
"140374651695040check_dpi_scaling"
("after" script)
invalid command name "140374651691712click_animation"
while executing
"140374651691712click_animation"
("after" script)
invalid command name "140374651695744update"
while executing
"140374651695744update"
("after" script)
My code for login is
def login(self):
con=sqlite3.connect(database=r'ims.db')
cur=con.cursor()
try:
if self.uid.get()=="" or self.password.get()=="":
messagebox.showerror("Error","All fields are required",parent=self.root)
else:
cur.execute("select utype,uid from user where uid=? AND pass=?",(self.uid.get(),self.password.get()))
user=cur.fetchone()
uid=user[1]
if user==None:
messagebox.showerror("Error","Invalid username/password",parent=self.root)
elif user[0]=='Admin':
self.root.destroy()
obj=Admin(uid)
obj.mainloop()
else:
self.root.destroy()
obj=User(uid)
obj.mainloop()
except Exception as ex:
messagebox.showerror("Error",f'Error due to : {str(ex)}',parent=self.root)
I know this error happens because even though the window is destroyed different methods are still running. I had similar problem in my previous project which I fixed using after_cancel() but that time method that was running was function I had made so I knew where it was so It was easy to fix. But this time I don't know how to fix this issue, I think this issue is due to the method of CustomTkinter running even after destroying the window. Also, I am sorry for my English if you are not sure about mu qwery ask me, I will do my best to explain it.
I tried this solution but it didn't work.

Answer 1

I had a similar problem recently that was solved by using self.root.quit() instead of destroy()
E.G.:
try:
if self.uid.get() == "" or self.password.get() == "":
messagebox.showerror(
"Error",
"All fields are required",
parent=self.root
)
else:
cur.execute(
"select utype,uid from user where uid=? AND pass=?",
(self.uid.get(), self.password.get())
)
user = cur.fetchone()
uid = user[1]
if user is None: # editorial - use 'is' when comparing with 'None'
messagebox.showerror(
"Error","Invalid username/password",
parent=self.root
)
elif user[0] == 'Admin':
self.root.quit() # change here...
obj = Admin(uid)
obj.mainloop()
else:
self.root.quit() # ...and here
obj = User(uid)
obj.mainloop()