Thank you so much. I just put a random URL in my app settings and it works perfectly now.
Placeholder in the callback url worked for me too! Thanks!
li_sai
#19
Problem solved, thanks.
But, what is the ‘call_back URL’ used for? Since it can be any legal URL
Is not a simplification if you got a put a fake callback url (or placeholder) just so it accepts dynamic callbacks. They could do a better job explaining this.
Thanks a lot! to @sebagomez to be the first to ask to @episod for the explanation
sorry but can you give me a simple example? i tried everything and none of them worked!! thanks
Thanks a lot 
It is working great
can you please say how to write a placeholder in a call back url
set callback url to ‘oob’
You ended my 45-minute search for a solution to this… (I should have noticed I didn’t have the callback URL defined as I had in another app… duh) THANK YOU… THANK YOU… THANK YOU…!
after two years of posting the answer also your answer is helped me 
just something like https://example.com/controller/method should work fine…
this callback url example worked for me when I had the problem: https://example.com/callback.php
I also set the check box to Allow this application to be used to Sign in with Twitter