Nutch error: crawled already exists

I am using the command below in nutch.
$ bin/nutch crawl urls -dir crawled -depth 3 -threads 4

Then get the erroras below.
Exception in thread "main" java.lang.RuntimeException: crawled already exists.
        at org.apache.nutch.crawl.Crawl.main(

May you give any suggestion?
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$ rm -Rf crawled
$ $ bin/nutch crawl urls -dir crawled -depth 3 -threads 4

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turbot_yuAuthor Commented:
Great, start working,

What does the magic word means. Thanks
nutch, whatever it is, apparently expects to create its own directory to put its results in. The first command empties the directory and deletes it
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turbot_yuAuthor Commented:
Thanks  a lot, I am quite new to nutch, is there any good and simple tutorial materials, thanks.
Never heard of it sorry ;-)
turbot_yuAuthor Commented:
Then any web, how to learn it ya.
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