From unity 3d to Xcode

Hello every one I`m new with iOS development so far I created an app but when I export it to Xcode it Always give me these errors

(null): warning: (armv7) /Users/Albert/myfirstapp/iOS/Game/Libraries/libiPhone-lib.a(CharacterController.o) object file doesn't contain DWARF debug information

(null): warning: (armv7) /Users/Albert/myfirstapp/iOS/Game/Libraries/libiPhone-lib.a(Cloth.o) object file doesn't contain DWARF debug information

(null): warning: (armv7) /Users/Albert/myfirstapp/iOS/Game/Libraries/libiPhone-lib.a(FixedJoint.o) object file doesn't contain DWARF debug information

(null): warning: (armv7) /Users/Albert/myfirstapp/iOS/Game/Libraries/libiPhone-lib.a(Joint.o) object file doesn't contain DWARF debug information

(null): warning: (armv7) /Users/Albert/myfirstapp/iOS/Game/Libraries/libiPhone-lib.a(Material.o) object file doesn't contain DWARF debug information

I hope someone helps me thanks