App crashing while using TaifunFile extension

I am trying to make whats app tool kit but when i open this screen my application is crashing because of taifunfile filesync component

what about providing the exact error message?
does it happen while using the companion app or only after building the app?

and what about debugging your app?
use Do it to debug your blocks, see also tip 4 here App Inventor: How to Learn | Pura Vida Apps
see also Live Development, Testing, and Debugging Tools

what is the filelist, which will be returned?
what happens, if you only display the returned filelist in a label as test?


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