i delete a screen so my app doesnot built whats the reason behind this?
I don't know the inner working of the ai2 storage servers, but I know the cure.
Export the aia file of the project.
Rename the aia file to something new.aia
Import the new aia to a new Project name.
If that doesn't help, either upload the aia here for us to examine or post the full build error log, especially the bottom.