title: R tm package tm.plugin.tags stopped working
body: <p>I use the tm.plugin.tags for sentiment analysis:</p>
  
  <pre><code>pos=sapply(search.corpus,tm_tag_score,tm_get_tags("Positiv"))
  neg=sapply(search.corpus,tm_tag_score,tm_get_tags("Negativ"))
  </code></pre>
  
  <p>Somehow it stopped working on my Linux machine. The library loads without warnings, and is shown as loaded in the packages view of RStudio. However the functions are not available:</p>
  
  <pre><code>No documentation for ‘tm_tag_score’ in specified packages and libraries:
  you could try ‘??tm_tag_score’
  </code></pre>
  
  <p>However, the same script is working fine in Windows. 
  Does anybody know what the problem could be?</p>