WP Job Manager – the_job_permalink return empty

Hi! I’m using th “wp job manager” plugin, witch works pretty well.
The only things that is not working is that when i list all the job position (using the shortcode in my page), it lists all the open positions, but with no chance to open the detail of the position.
In other words the HREF of the A tag of the list, is empty like this:

<li class="job_listing">
	<a href="">

		<img class="company_logo" src="..." alt="">		<div class="position">
			<h3>Posizione Prova</h3>
			<div class="company">
											</div>
		</div>
		<div class="location">
			Terlizzi		</div>
		<ul class="meta">

			<li class="job-type comunicazione">Comunicazione</li>
			<li class="date"><date>3 giorni fa</date></li>

					</ul>
	</a>
</li>

as you can see the href is empty.
I was trying to print variables directly form the plugin file just for debugging purpose, but the function the_job_permalink, is still empty.

Any help will be apreciated