Program Error (Server Error 500)

<h1>Program Error (Server Error 500)</h1>
                  <hr />
             <p>
              <em>
              More information about this error may be available in the
              server error log and/or program error log.
              </em>
             </p>
             <hr />
               <pre>Can't use 'defined(@array)' (Maybe you should just omit the defined()?) at DADA/perllib/CGI.pm line 510, &lt;CONFIG&gt; line 1.
Compilation failed in require at DADA/App/ScreenCache.pm line 103, &lt;CONFIG&gt; line 1.
BEGIN failed--compilation aborted at DADA/App/ScreenCache.pm line 103, &lt;CONFIG&gt; line 1.
Compilation failed in require at mail.cgi line 162, &lt;CONFIG&gt; line 1.
BEGIN failed--compilation aborted at mail.cgi line 162, &lt;CONFIG&gt; line 1.
</pre>