ios7 - Ios :: dyld: Symbol not found: _OBJC_CLASS_$_UIAlertAction -

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i have app works fine ios sdk 8.3 , xcode 6. when check backward compatibility ios sdks 7.1 , 7.1 simulator fails.

app crashes following error

dyld: symbol not found: _objc_class_$_uialertaction referenced from: /users/apogaeis/library/developer/coresimulator/devices/f48b2d65-9ee8-4737-a0ce-2882d105c6c9/data/applications/25b9dcde-4bc6-4568-8ebe-3474fe559cbc/appname.app/appname expected in: /library/developer/coresimulator/profiles/runtimes/ios 7.1.simruntime/contents/resources/runtimeroot/system/library/frameworks/uikit.framework/uikit in /users/apogaeis/library/developer/coresimulator/devices/f48b2d65-9ee8-4737-a0ce-2882d105c6c9/data/applications/25b9dcde-4bc6-4568-8ebe-3474fe559cbc/appname.app/appname

please suggest resolve issue.

how can make work ios versions?

thanks

in case, uikit.framework had marked optional rather required app works fine....


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