title: read.demogdata in R demography package
body: <p>While using the demography package in R, I tried out the following example:</p>
  
  <pre><code>norway &lt;- read.demogdata("Mx_1x1.txt", "Exposures_1x1.txt",
      type="mortality", label="Norway")
  </code></pre>
  
  <p>I obtained the following output.
  Error in file(file, "rt") : </p>
  
  <blockquote>
    <p>cannot open the connection</p>
  </blockquote>
  
  <p>In addition: Warning message:</p>
  
  <blockquote>
    <p>In file(file, "rt") :
          cannot open file 'Mx_1x1.txt': No such file or directory</p>
  </blockquote>
  
  <p>Why does that keep occuring? How can I overcome it and get a proper output?</p>