{
    NSString* tempDir = NSTemporaryDirectory();
    NSString* tempDirFolder = [tempDir stringByAppendingPathComponent:@"FinaleTempFiles"];

    NSError* theError = nil;

    BOOL fileOK = [[NSFileManager defaultManager] createDirectoryAtPath:tempDirFolder withIntermediateDirectories:NO attributes:nil error:&theError ];
    if ( !fileOK )
        NSLog(@"createDirectoryAtPath %@", [theError localizedDescription]);
}

2013-05-31 18:52:46.830 mdimport[43160:707] createDirectoryAtPath You don’t have permission to save the file “FinaleTempFiles” in the folder “T”.