Help using copyfile on mac osx

Sorry if this question has been asked before, but I can't seem to figure out how to use copyfile, movefile or any of the equivalents on my Mac OSX. I keep receiving this error, MATLAB:COPYFILE:OSError.

I'm thinking there's a solution either using the system function or the unix function, but I can't get anything to work. For example, how do I rewrite this line of code. I have a file, test.txt, and just want to make a copy of it as test2.txt. I'm already in the correct directory.

[status,message,messageID]=copyfile('test.txt','test2.txt')

[Geoff Hayes]

John - when you run the above statement, what is the message value? The MATLAB:COPYFILE:OSError is the messageID but it is the other that may provide some more detail.

I am running MATLAB 2014a on a Mac OS X 10.8.5 and have not experienced any problems using the movefile or copyfile functions.