What can cause a "Symbol not found: _objc_setProperty_atomic" error when compiling for iOS 5.0?

Question

I'm having a compiling error in IOS 5. The error I get is:

wait_fences: failed to receive reply: 10004003
dyld: lazy symbol binding failed: Symbol not found: _objc_setProperty_atomic
Referenced from: /var/mobile/Applications/952C640B-8310-4028-AAE5-FD308D02B005/MorethanMusic.app/MorethanMusic
Expected in: /usr/lib/libobjc.A.dylib

dyld: Symbol not found: _objc_setProperty_atomic
Referenced from: /var/mobile/Applications/952C640B-8310-4028-AAE5-FD308D02B005/MorethanMusic.app/MorethanMusic
Expected in: /usr/lib/libobjc.A.dylib

How can I fix this error?

Answer 1

Paul's answer is only halfway there. After some searching, I found this thread, which suggested you make the deployment target the same for all subprojects:

It doesn't matter what they are (at least for this problem), as long as they're the same. This solved this precise error for me.

Don't forget to clean the GData Project's DerivedData Folder before building.

Answer 2

Set your Deployment target to iOS5 in your build settings.