Application Loader Error-90086

ERROR ITMS-90086: “Missing 64-bit support. Beginning on February 1, 2015 new iOS apps submitted to the App Store must include 64-bit support and be built with the iOS 8 SDK. Beginning June 1, 2015 app updates will also need to follow the same requirements. To enable 64-bit in your project, we recommend using the default Xcode build setting of “Standard architectures” to build a single binary with both 32-bit and 64-bit code.”

I am receiving this error when I try to upload my api to Application Loader after I have migrated my project to 4.9 version. How can I solve it?