Koa-handlebars: Unable to render view: The partial could not be found

// project/layouts/main.hbs

<!DOCTYPE html>
<html lang="en">
<head>
</head>
<body>
    {{{@body}}}
</body>
</html>


// project/views/home-public.hbs

{{> nav-public}}
<div class="container">
    <div class="starter-template">
        <h1>Home Public</h1>
        <p class="lead">This is my home.</p>
    </div>
</div>


// project/partials/nav-public.hbs

<nav class="navbar navbar-inverse navbar-fixed-top">
    <div class="container">
        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <a class="navbar-brand" href="/">Example</a>
        </div>
        <div id="navbar" class="collapse navbar-collapse">
            <ul class="nav navbar-nav">
                <li class="active"><a href="/">Journey</a>
                </li>
                <li><a href="/">Departures</a>
                </li>
                <li><a href="about" style="margin-left:1em">About</a>
                </li>
            </ul>
            <ul class="nav navbar-nav navbar-right">
                <li><a href="/signout">Sign in</a>
                </li>
            </ul>
        </div>
    </div>
</nav>

Node code that runs:

app.use(handlebars({
    defaultLayout: 'main'
}));

app.use(function* () {
    yield this.render('home-public', {
        user: {
            email: "name@example.com"
        }
    });
});

I can't see what's wrong. Any ideas?