# External App launcher debug error

**URL:** <https://forum.novacura.com/t/external-app-launcher-debug-error/629>\
**Category:** Flow Classic\
**Created:** [February 22, 2024, 4:11pm UTC](https://forum.novacura.com/t/external-app-launcher-debug-error/629 "2024-02-22T16:11:44Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![caschetp](https://avatars.discourse-cdn.com/v4/letter/c/7C9FD7/32.png) [@caschetp](https://forum.novacura.com/u/caschetp)\
**Post date:** [February 22, 2024, 4:11pm UTC](https://forum.novacura.com/t/external-app-launcher-debug-error/629/1 "2024-02-22T16:11:44Z")

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I am trying to test a small flow with just the external app launcher, but I keep getting the same error  
"binding method not found for externalapplauncher. Debugger will close.

Have you come across this before.  
also other than the help screen, is there any more information on how it actually works ?  
thanks

Paul

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<div class="post-metadata">

**Author:** ![OlaCarlander](https://dub1.discourse-cdn.com/flex013/user_avatar/forum.novacura.com/olacarlander/32/205_2.png) [@OlaCarlander](https://forum.novacura.com/u/OlaCarlander)\
**Post date:** [February 22, 2024, 6:16pm UTC](https://forum.novacura.com/t/external-app-launcher-debug-error/629/2 "2024-02-22T18:16:46Z")

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You cannot run external app launcher in the debugger, only on iOS or Android. If you google “deep link” you will find more info I think, but the idea is to have for example MS teams open on the phone when you click the deep link in the workflow (running the iOS app of Flow).