When compiling in xCode get Undefined symbols for architecture armv7 or Xcode cannot run using the selected device

I did a project in Unity and try to compile it for iOS. The compilation in Unity is going well. Then, I try to compile in xCode and get the 7 errors all from this type:> Undefined symbols for architecture> armv7:> "__SetUnitySignalToReadVector3ArrayDelegatePointer",> referenced from: RegisterMonoModules()> in RegisterMonoModules.o> "__FillVector3ArrayByRef", referenced> from: RegisterMonoModules() in> RegisterMonoModules.o> "__SetUnityCommandDelegatePointer",> referenced from: RegisterMonoModules()> in RegisterMonoModules.o> "__SetUnityLogDelegatePointer",> referenced from: RegisterMonoModules()> in RegisterMonoModules.o> "__SetUnityIsReady", referenced from:> RegisterMonoModules() in> RegisterMonoModules.o> "__CallLogOnNative", referenced from:> RegisterMonoModules() in> RegisterMonoModules.o ld: symbol(s)> not found for architecture armv7> clang: error: linker command failed> with exit code 1 (use -v to see> invocation) According to many discussions I should change the Architectures and Valid Architecture in Build Setting to Armv6 instead of Armv7. I did it and gladly the compilation end successfully. But, then, when trying to run it on my iPhone 5, I get the following massage: > Xcode cannot run using the selected> device. Choose a destination with a> supported architecture in order to run> on this device. How can I make this to compiled successfully in xCode and in the same time run on iPhone 5?