title: R could not find function "checkAtAssignment" while running rworldmap
body: <p>I need your help with R not being able to run a function with rworldmap package.</p>
  
  <p>When using rworldmap package in R and trying to 'joinCountryData2Map'</p>
  
  <pre><code>sPDF &lt;- joinCountryData2Map (myframe, joinCode = "NAME", nameJoinColumn = "location", verbose = TRUE, suggestForFailedCodes = TRUE ) 
  </code></pre>
  
  <p>I get the following error:</p>
  
  <pre><code>Error in mapWithData@data &lt;- cbind(mapWithData@data, dF[matchPosnsInUserData,  : 
    could not find function "checkAtAssignment"
  Calls: joinCountryData2Map
  Execution halted
  </code></pre>
  
  <p>My guess is that R needs methods package, which I could not find for my R version.</p>
  
  <p>Any suggestings why I 'could not find function "checkAtAssignment"'?</p>
  
  <p>My R version is 3.0.2 Patched.</p>