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(Crawl.java:85)

May you give any suggestion?
turbot_yuAsked:
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CEHJCommented:
Try
$ 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
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CEHJCommented:
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.
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CEHJCommented:
Never heard of it sorry ;-)
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turbot_yuAuthor Commented:
Then any web, how to learn it ya.
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