Errore in amavis-stat

[Sbarboff2005]

Ciao qualcuno saprebbe correggere questo errore:

Notice: Use of undefined constant calcpr - assumed 'calcpr' in /usr/share/amavis-stats/amavis-stats.php on line 115
amavis-stats::error: rrd_graph(): 1

    function rrd_graph ($img, $opts, $count) {
        global $rrd_error_val;

        unset($output);

        $cmd = "rrdtool graph $img '". implode("' \\\n'",$opts) . "'" .
       //        " 2>&1";
        //  $cmd = "/usr/local/rrdtool/bin/rrdtool graph $img '".
        //  implode("' \\\n'",$opts) . "'" .
          " 2>&1";

        asDbg($cmd, 1);
        $out = exec($cmd, $output, $rrd_error_val);

        if ($rrd_error_val) {
            if (!is_numeric($rrd_error_val)) {
                $rrd_error_val = $output[0];
            }
            return false;
        }

        asDbg($output);

        if (preg_match("/(\d+)x(\d+)/", $output[0], $matches)) {
            $retval["xsize"] = $matches[1];
            $retval["ysize"] = $matches[2];
        } else {
            $rrd_error_val = $output[0];
            return false;
        }

        array_shift($output);

        foreach ($output as $index => $value) {
            $retval[calcpr][$index] = $value;            //  [COLOR=orangered] linea 115 qui[/COLOR] 
        }
        return $retval;
    }