html - Getting error while trying to load HDFS with tweeter data -

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i getting below error though have given correct keys , token.
trying load data tweeter hdfs....
have entered correct key , tokens(i canot share key , token here,but assure correct).
please me in understanding:

15/06/29 21:39:53 info twitter4j.twitterstreamimpl:401:authentication credentials (https://dev.twitter.com/docs/auth) missing or incorrect. ensure have set valid consumer key/secret, access token/secret, , system clock in sync.

<html>\n<head>\n<meta http-equiv="content-type" content="text/html;          charset=utf-8"/>\n<title>error 401            unauthorized</title> </head> 

<h2>http error: 401</h2> <p>problem accessing '/1/statuses/filter.json'. reason: <pre>    unauthorized</pre>

it happening due clock out of sync:
solved when ran below command:

sudo ntpdate ntp.ubuntu.com

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