I have only one error, for me it is caused by including my layout template in <body>and specifying it as an option layoutTemplate. To fix this, I removed include from <body>.
Here is before and after my code;
example.html (before)
<head>
<title>example</title>
</head>
<body>
{{>layout}}
</body>
<template name="layout">
<div>{{>yield}}</div>
</template>
example.js (before)
if(Meteor.isClient) {
Router.configure({
layoutTemplate: 'layout'
});
}
example.html()
<head>
<title>example</title>
</head>
<body>
</body>
<template name="layout">
<div>{{>yield}}</div>
</template>
example.js( - , )