Base SDK Missing Solution - iPhone Development

Base SDK missing error is commonly occurred, when we upgraded the iPhone SDK and trying to open older apps in newer one.

1. Open application in xcode
2. Go to projects
3. Edit project settings
4. Click on build tab
5. Change the value in the base SDK option
6. Go to projects again
7. Edit active target
8. Click on build tab
9. Change the base SDK option as the same

Hope Coding...