And that would be, if I may ask?
The Alexa version merges a fairly old feature I wrote, which never made it into the mainline App Inventor branch, that uses the category field of the @SimpleProperty annotation to group the designer properties into collapsible categories in the properties panel. However, this information isn't emitted in the current build system for extensions (since it's not needed) and so when the Alexa system goes to render the grouped properties it creates a null pointer deference on the category name since it's not there.
I've already come up with the fix and tested it with the BLE extension and submitted a patch for review. Hopefully we can get it deployed next week.
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deal ,thank you for your help let's hope it will work