How to use iAds in xcode 4.1

In i Phone presently i am working with iAds concept in my project my project is successes fully run with simulator 4.1 but device 4.2.1 version fail to device error this kind of error occurred what is the reason? My error is

WARNING: Falling back to active SDK directory at: /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.1.sdk

GNU gdb 6.3.50-20050815 (Apple version gdb-1472) (Thu Aug  5 05:54:10 UTC 2010)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB.  Type "show warranty" for details.
This GDB was configured as "--host=i386-apple-darwin --target=arm-apple-darwin".tty    /dev/ttys000
Loading program into debugger…
Program loaded.
target remote-mobile /tmp/.XcodeGDBRemote-169-47
Switching to remote-macosx protocol
mem 0x1000 0x3fffffff cache
mem 0x40000000 0xffffffff none
mem 0x00000000 0x0fff none
run
Running…
[Switching to thread 11523]
[Switching to thread 11523]
sharedlibrary app开发者_如何学JAVAly-load-rules all
continue
warning: UUID mismatch detected with the loaded library - on disk is:
/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.1.sdk
/System/Library/Frameworks/Foundation.framework/Foundation

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XCode 4.1 comes with iOS 4.3 your device is running 4.2.1, thus the SDK does not match. I've you upgrade you iOS on your device to the latest one it should work.

Or when you connect your device the organizer will ask you if it may collect the symbols from your device. If so let it collect the symbols. Then it will know which version your deice is running and it should work.