After several month of running my project on my Android tablet, I made some changes.
Before making the changes I updated the designer to version 184.108.40.206.
The changed project runs fine in the designer but when I want to start it in the android tablet, also undated to the 220.127.116.11 version, I get the following message:
Please close the app & try opening the file again.
I tried that several times yesterday and 4 times today but the new project will NOT start.
What could be wrong?