I’m trying to create a web-application using Tizen SDK. When I launch
the app everything is fine but when I press a “Back” button on emulator
nothing happens and I see a message 55435/js/main.js:9:ReferenceError: Can't find variable: tizen I looked at main.js and there’s a code:

//Initialize function
var init = function () {
// TODO:: Do your initialization job
console.log("init() called");

// add eventListener for tizenhwkey
document.addEventListener('tizenhwkey', function(e) {
    if(e.keyName == "back") {
        tizen.application.getCurrentApplication().exit(); // HERE IS THE ERROR
    }
});

};
$(document).bind('pageinit', init);

<script src="tizen-web-ui-fw/latest/js/jquery.js"></script>
<script src="tizen-web-ui-fw/latest/js/tizen-web-ui-fw-libs.js"></script>
<script src="tizen-web-ui-fw/latest/js/tizen-web-ui-fw.js" data-framework-theme="tizen-white"></script>
<script type="text/javascript" src="./js/main.js"></script>

I think some script should be added but I don’t know which one.

Update: I’m using Tizen SDK 2.2 installed on Linux Mint 15.