error in astrojs.coordinates.ecliptic2azel

Hi! I tried to use your astro.js lib but when I call var sunazel = astrojs.coordinates.ecliptic2azel(sunpos.lat, sunpos.lon, lst, lat); I get the error SCRIPT438: Object doesn't support property or method 'vectorMultiply' Did I something wrong? All parameters are numeric values! Thanks Peter

<!DOCTYPE html>
<html>

<!-- astro.js : http://slowe.github.io/astro.js/ -->

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

<style type="text/css">

</style>

<script language="javascript" type="text/javascript" src="astro.js/astro.js"></script>
<script language="javascript" type="text/javascript" src="astro.js/astro.dates.js"></script> <!-- JD, GST, LST -->
<script language="javascript" type="text/javascript" src="astro.js/astro.ephem.js"></script> <!-- sunPos, moonPos -->
<script language="javascript" type="text/javascript" src="astro.js/astro.coords.js"></script> <!-- coordinates and value transformation -->
<script language="javascript" type="text/javascript" src="astro.js/astro.coordinates.js"></script> <!-- coordinates and value transformation -->
<script language="javascript" type="text/javascript">

var lng = 48.12;
var lat = -16.32;
var tz  = -1;

function initAstro() {
    //astrojs.ready(function(e){ });
    // ...
    doAstro();
    return;
}

function doAstro() {
    var txt = "";
    var dt = new Date();
    txt += dt + "<br>\n";
    var jd = astrojs.dates.getJulianDate(dt);
    txt += "Julian Date (JD) : " + jd + "<br>\n";
    txt += "Greenwich Sidereal Time (GST) : " + astrojs.dates.getGST(dt) + "<br>\n";
    var lst = astrojs.dates.getLST(dt, lng);
    txt += "Local Sidereal Time (LST) : " + lst + "<br>\n";
    var sunpos = astrojs.ephem.sunPos(jd);
    txt += "Sun Pos : lat:" + sunpos.lat + "  lon:" + sunpos.lon + "  Mo:" + sunpos.Mo + 
        "  D:" + sunpos.D + "  N:" + sunpos.N + "<br>\n";
    var sunazel = astrojs.coordinates.ecliptic2azel(sunpos.lat, sunpos.lon, lst, lat);   // <<<< ERROR
    txt += "Sun Pos : az:" + sunazel.az + "  el:" + sunazel.el + "<br>\n";
    var moonpos = astrojs.ephem.moonPos(jd, sunpos);
    txt += "Moon Pos : lat:" + moonpos.lat + "  lon:" + moonpos.lon + "<br>\n";
    txt += "mean Obliquity : " + astrojs.coordinates.meanObliquity(jd) + "<br>\n";

    document.getElementById("output").innerHTML = txt;
    return;
}

</script>

</head>

<body onload="initAstro()">

<form name="astro" action="#" onsubmit="doAstro();">
    <button onclick="doAstro();">submit</button>
</form>
<br><br>
Result:<br>
<p id="output">*</p>

</body>
</html>

slowe / astro.js

error in astrojs.coordinates.ecliptic2azel #2