title: Loading files in Prolog
body: <p>I am going through a Prolog tutorial.  It is telling me I can load other prolog files by typing:</p>
  
  <pre><code>[filename].
  </code></pre>
  
  <p>but every time I try this am getting</p>
  
  <pre><code>ERROR: load_files/2: Arguments are not sufficiently instantiated.
  </code></pre>
  
  <p>The file is in the same directory as the one am working in.</p>
  
  <p>Here is a copy of the entire query and error:</p>
  
  <pre><code>12 ?- [KB5].
  
  ERROR: load_files/2: Arguments are not sufficiently instantiated
  </code></pre>
  
  <p>What am I doing wrong?</p>