It looks like you have installed and activated WP-SimpleViewer but are not using it.
Your embedding code has the line:

flashvars.galleryURL="gallery.xml";

... so the gallery is looking for the file here:

http://yourfitnessguides.com/gallery.xml

... but it does not exist in this location.
Try using the baseURL method of embedding as documented here: http://simpleviewer.net/simpleviewer/su … l#external
For example, upload your SimpleViewer gallery folder (not just the contents) to the root of your web space.
If your gallery folder is called 'mygallery', then the embedding code you would use would be:

<!--START SIMPLEVIEWER EMBED.-->
<script type="text/javascript" src="http://yourfitnessguides.com/mygallery/svcore/js/simpleviewer.js"></script>
<script type="text/javascript">
var flashvars = {};
flashvars.baseURL = "http://yourfitnessguides.com/mygallery/";
simpleviewer.ready(function () {
simpleviewer.load("sv-container", "800", "600", "222222", true, flashvars);
});
</script>
<div id="sv-container"></div>
<!-- END SIMPLEVIEWER EMBED -->

(You may wish to change the dimensions of the gallery to suit your page.)

Otherwise, you can create a gallery within WordPress itself by using WP-SimpleViewer and following the instructions here: http://simpleviewer.net/simpleviewer/su … pleviewer/

Incidentally, your gallery displays the 'Gallery XML Not Found' message rather than nothing at all because you have installed and activated WP-SimpleViewer and your gallery is using the 'svcore' folder from the plugin, not your current embedding code.

If you choose not to use WP-SimpleViewer, then you will need to upload your gallery folder manually to your web server.

The screenshot you posted shows sv-Builder (not WP-SimpleViewer).
Using your Flickr user name in svBuilder on my computer shows your images locally.
Make sure your firewall settings are not blocking svBuilder from accessing the internet.

It should be much easier for you to create a Flickr-based SimpleViewer gallery using WP-SimpleViewer within WordPress (rather than using svBuilder and then uploading the gallery folder) by following the instructions here: http://simpleviewer.net/simpleviewer/su … er/#create
In particular, please see the 'Adding Images from Flickr' section.