error - missing required architecture in i386?!- using xcode 4

Please help,

I am getting the following errors in my xcode:

ld: warning: ignoring file /Users/johnbiddulph/Documents/xcode/calc/AVFoundation.framework/AVFoundation, missing required architecture i386 in file
ld: warning: ignoring file /Users/johnbiddulph/Documents/xcode/calc/AudioToolbox.framework/AudioToolbox, missing required architecture i386 in file
Undefined symbols for architecture i386:
"_AudioServicesCreateSystemSoundID", referenced from:
-[calcViewController viewDidLoad] in calcViewController.o
"_AudioServicesPlaySystemSound", referenced from:
-[calcViewController playZero:] in calcViewController.o

I have added relevant AVFoundation and AudioToolbox to my .h file

you need to change sequence of architecture value in info.plist file. keep i3886, arv6 and arv7