16.3 "Couldn't create directory"

[soulfoodz]

When I enter the program in xcode, I get "Couldn't create directory". However, when I list the directories within the parent directory (found in terminal via the currentDirectoryPath method) "testdir" is shown.  Deleting "testdir" via terminal and re-running the program doesn't change the result. Neither does entering the entire path, as seen in the snippet below.

Can someone help me understand why that is happening?

Code: (Objective-C)

#pragma mark - Program 16.3
        

        NSString        *dirName = @"/Users/macbookpro/Library/Developer/Xcode/DerivedData/chpt16-guztkkwddxxlehggqvdpabxemrok/Build/Products/Debug/testdir";
        NSString        *path;
        NSFileManager   *fm;
        
        // Create an instance of the file manager
        
        fm = [NSFileManager defaultManager];
        
        // Get current directory
        
        path = [fm currentDirectoryPath];
        NSLog(@"Current directory path is %@", path);
        
        // Create a new directory
        
        if ([fm createDirectoryAtPath: dirName withIntermediateDirectories: YES attributes: nil error: NULL] == NO);
        {
            NSLog(@"Couldn't create directory");
            return 1;
        }