Error n tweets were requested but the API can only return 0
<p>I am unable to retrieve any tweets using twitteR package in R. For example this request:</p>

<pre><code>nbahash_tweets = searchTwitter("#nba",since='2013-01-01', until='2014-02-25',n=20)
</code></pre>

<p>Shows me this warning message:</p>

<blockquote>
  <p>Warning message: In doRppAPICall("search/tweets", n, params = params,
  retryOnRateLimit = retryOnRateLimit,  :   20 tweets were requested but
  the API can only return 0</p>
</blockquote>

<p>What could be the reason of the problem?</p>