Why isn't the enable prefetch command working?

I shut off DNS prefetching to test an internet performance problem that I'm having....
I then tried using the command:
defaults delete com.apple.safari WebKitDNSPrefetchingEnabled
....in a Terminal window to re-enable DNS prefetching and I got this message after hitting enter:
2013-11-18 20:21:24.479 defaults[359:507]
Domain (com.apple.safari) not found.
Defaults have not been changed.
Any idea what this means?  Am I to assume that because of this error that DNS prefetching has not been re-enabled correctly?
Thanks,
John

Hi Linc....Thanks.  I'll take your word for it......and I say that  only because I had just issused the command to disable prefetching right before I typed in the re-enable command.  So.....it should have been disabled.
Instead of using the command above to re-enable it, I tried this one instead that I read about somewhere:
defaults write com.apple.safari WebKitDNSPrefetchingEnabled -boolean true
.....and I got no error on that one.
Is there a command that can be issued to tell whether pre-fetching is on or off?

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