An app I've built and installed many times started giving me this error last night. I've uninstalled the app. I can build & install other app inventor apps, but not this one.
I've cleared cache & storage in Play Store and Play Services, and I think it was installer services. Still nothing.
I am ready to try something extreme like rebuild the app in a new file. Even wipe my phone if need me.
Before I do, I thought I'd check to see if there was anything anyone might suggest.
Which is why I asked for the other extensions, if any, in use in the project. Two extensions could be conflicting with each other. @vknow360 could check this out ?