Something is wrong with my Security.Framework, but I don't know what.

I've been developing apps for the iPhone recently, and when I try compiling to test my app, I get an error. I tried the terminal alternative to Xcode's code signing, and this is the error it shows:

dyld: Symbol not found: _kSecCFErrorArchitecture Referenced from: /usr/bin/codesign Expected in: /System/Library/Frameworks/Security.framework/Versions/A/Security in /usr/bin/codesign Trace/BPT trap

How would I fix this? It seems to be a security framework problem, because I tried reinstalling the Xcode Dev tools, but I still get this problem.