title: Error when copy file from one place to another in NSFileManager
body: <p>When I use NSFileManager to copy one file (directory) from one place to another by using copyItemAtPath, it gives me error.</p>
  
  <p>Here is the code:</p>
  
  <pre><code> [[NSFileManager defaultManager]copyItemAtPath:@"/Users/name/Documents/localhost/websiteDesign/_Software/" toPath:@"/Volumes/NAME/" error:&amp;handleError];
   NSLog(@"%@", [handleError description]);
  </code></pre>
  
  <p>Here is the error:</p>
  
  <pre><code> Error Domain=NSCocoaErrorDomain Code=516 "“_Software” couldn’t be copied to “Volumes”   because an item with the same name already exists." UserInfo=0x102842d00
   {NSSourceFilePathErrorKey=/Users/name/Documents/localhost/websiteDesign/_Software/, NSUserStringVariant=(Copy), NSDestinationFilePath=/Volumes/NAME/, NSFilePath=/Users/name/Documents/localhost/websiteDesign/_Software/, NSUnderlyingError=0x10283f8e0 "The operation couldn’t be completed. File exists"}
  </code></pre>
  
  <p>However, when I change the name of the destination file which is @"/Volumes/NAME/", to whatever else like @"/Volumes/aaa/", then the error will gone. I do not know why. Thanks !!</p>