1- Make sure you see the Main.bal in your "Files" list on the IDE
2- Do you have the option Project -> Do not overwrite manifest file checked? if yes, then uncheck it.
It would be much easier to help you if you posted your project as a zip file (IDE menu Files / Export As Zip).
Without seeing your code it's impossible to give you a concrete advice.
Thanks for your quick reply guys.
This is WEIRD .
I do not have the Do not overwrite manifest file checked.
I see the main.bal and the contactus.bal.
I switched to my wife's account on my computer I started Basic4android . I started a new project, etc and ALL works fine.
I switch back to my account and no go.
I wonder what the problem is when I am on my account ?
Strange, your project works fine on my device.
So I don't know what exactly the problem is.
Are you sure that in the not working project main.bal is really in the Files folder of the project ?
I suggest you to open a new folder, copy the zip file you posted and try again.
Or try the attached project with a second activity 'contactus' in a new folder.