That's an odd and unhelpful error message.
Does your device have an antivirus app? Maybe try shutting it off. I wonder if it is possible that your tablet is blocking the ports that AppGameKit Player needs.
If you still can't get it to work I'd suggest building your app with this
https://developer.thegamecreators.com/android/create_apk.php
and manually installing the APK for the application. You'll have to allow apps to be installed from outside sources in your tablet's settings.
Let us know how it works out for you.