# Unable to get callback Url for facebook messenger

**URL:** <https://forum.rasa.com/t/unable-to-get-callback-url-for-facebook-messenger/42258>\
**Category:** Rasa Open Source\
**Created:** [April 9, 2021, 5:49am UTC](https://forum.rasa.com/t/unable-to-get-callback-url-for-facebook-messenger/42258 "2021-04-09T05:49:51Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![pvg14](https://avatars.discourse-cdn.com/v4/letter/p/58956e/32.png) [@pvg14](https://forum.rasa.com/u/pvg14)\
**Post date:** [April 9, 2021, 5:49am UTC](https://forum.rasa.com/t/unable-to-get-callback-url-for-facebook-messenger/42258/1 "2021-04-09T05:49:51Z")

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OSError: [Errno 10048] error while attempting to bind on address (‘0.0.0.0’, 5055): only one usage of each socket address (protocol/network address/port) is normally permitted this is the error while running rasa run actions command I am trying to integrate a facebook messenger to rasa core , unable to get the call back url , any help would be appreciated

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**Author:** ![kalkbrennerei](https://dub1.discourse-cdn.com/flex013/user_avatar/forum.rasa.com/kalkbrennerei/32/11609_2.png) [@kalkbrennerei](https://forum.rasa.com/u/kalkbrennerei)\
**Post date:** [April 12, 2021, 8:54am UTC](https://forum.rasa.com/t/unable-to-get-callback-url-for-facebook-messenger/42258/2 "2021-04-12T08:54:42Z")

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Hi @pvg14! Have you tried choosing a different port? You can specify it by using `-p`

Let me know if this helps!! ✨