apk loading only after deleting APPINVENTOR directory!

I just completed my 1st app with AI - just so impressed (especially in comparison to Android Studio!)

The testing worked fine but installing the app not :(

I came across:

https://groups.google.com/d/msg/mitappinventortest/i2cMfzygxR8/eqY8ns-PBy4J

and low and behold: deleting the APPINVENTOR directory worked - my apk installed immediately :)))

I thought this might help others but was not able to post this on the linked post,

so hopefully this will help someone :)