Error about iOS 5 cocould not instantiate class named nslayoutconstraint

Because xcode 4.6.2 is used, SDK 6.1 is used when a new project is created, but it must be adapted to a lower version. This error occurs when the IOS simulator is selected as 5.0 during compilation and running.Cocould not instantiate class named nslayoutconstraintError. The cause is IOS
6. Newly Added autolaout attributes(For more information about autolayout attributes, seeHere)In IOS
5 is not supported, causing the project to crash, while the new project in xcode 4.6.2 uses the autolaout attribute by default.

Solution: Select XIB or storyboard and remove the autolaout status from the right-side property panel, as shown in figure