<head>
    <meta charset="UTF-8">
    <title>{% if page.title %}{{page.title}} - {{site.title}}{% else %}{{site.title}}{% endif %}</title>  
    <!-- <link href="https://fonts.googleapis.com/css?family=Open+Sans:300,300i,700" rel="stylesheet"> -->
    <link href="https://fonts.css.network//css?family=Open+Sans:300,300i,700" rel="stylesheet">
    <link rel="stylesheet" href={{ "/css/main.css" | prepend: site.baseurl }}>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    {% seo %}
</head>

<head>
    <meta charset="UTF-8">
    <title>{% if page.title %}{{page.title}} - {{site.title}}{% else %}{{site.title}}{% endif %}</title>  
    <!-- <link href="https://fonts.googleapis.com/css?family=Open+Sans:300,300i,700" rel="stylesheet"> -->
    <link href="https://fonts.css.network//css?family=Open+Sans:300,300i,700" rel="stylesheet">
    <link rel="stylesheet" href={{ "/css/main.css" | prepend: site.baseurl }}>
    <meta name="viewport" content="width=device-width, initial-scale=1">
</head>

Remove seo tag, jekyll can not build with it.
Remove seo tag, jekyll can not build with it.
