No section is defined as the main section
The main section is the one from which the whole application will start from. It will also be the one that links all the others and the first one to be seen by your App user (without having in count the initial splashes).
To solve it :
1. Double click on the icon that has your app name. In this case, our app is called “app name”:
2.Pick the one that will be the main section or create a new one
We created a main section called “Main Menu”. As you can see, now the application “app name” has its main section “Main Menu”.
