Hi, I've been using Xcode to write CoreAudio code recently, and it worked fine. Then one day, I get a message saying... Uncaught Exception: ***-[NSCF String replaceCharacters inRange: with string:]:nil arguement The stack backtrace has been logged to the console. Then whenever I tried to open a xcodeproj. file I get a similar error, that includes "The stack backtrace has been logged to the console." Then, Xcode won't let me open and compile my xcodeprojects, or my cpp files. I tried reinstalling Xcode twice and I still got the same errors. Does anyone know how to fix these problems? If so, I'd greatly appreciate it if you could respond asap.