Xcode 6.2 Error::can only being used when targeting IOS 4.2 or later

When using Xcode to open a demo that is down from the web, the compile can sometimes appear when the can only is used when targeting IOS 4.2 or later. This is caused by different versions of iOS running.

The solution is:

Click the project navigation file---select targets--> Select Build Setting--expand iOS Deployment Target

Change the iOS version to more than 4.2 to resolve

Or:

Click find--> to select Find in Project.

Search for deploy in the search box click Search results and modify the iOS deploy target version in the right property to resolve

Xcode 6.2 Error::can only being used when targeting IOS 4.2 or later