IOS "The Run destination My Mac 64-bit is not valid

1. IOS app project or MAC app project compilation error prompt:
"The Run destination My Mac 64-bit is not valid for Running the scheme ' * * * '.
The scheme ' * * * * contains no buildables that can is built for the SDKs supported by the run destination My Mac 64-bit. Make sure your targets all specify SDKs that is supported by this version of Xcode. "

2. Cause of the problem:
The SDK version set by the project and the Mac or IOS SDK version installed on the PC are inconsistent.

3. Workaround:
Solution,to Change the Base SDK Version:
1) Click on the project icon in the left hand panel.
2) In the right hand panel that appears, select Build Settings? All.
3) You'll see the option to change the "Base SDK". Architectures? Base SDK.
4) Change Base SDK option to your project corresponding SDK version, OS X SDKs or IOS SDKs. Eg:os X 10.8 or IOS 6.0.

IOS "The Run destination My Mac 64-bit is not valid