[рони]

wwwlopment,
проверяйте пути или ваши include

<?php
include_once(ROOT . '/header.php');
?>
<meta charset="utf-8">
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.3/css/font-awesome.min.css" rel="stylesheet">
<link href="https://cdn.rawgit.com/suyati/line-control/master//editor.css" rel="stylesheet" type="text/css">
    <link rel="stylesheet" href="/template/css/adminpanel.css"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script src="https://cdn.rawgit.com/suyati/line-control/master/editor.js"></script>

    <br>
    <div class="box">
        <!-- Box Head -->
        <div class="box-head">
            <h2>Редагувати блог</h2>
        </div>

        <?php if (isset($blogItem)): ?>
        <div class="form">
            <form action="/adminpanel/blogedit/<?php echo $blogItem['id'] ?>" enctype="multipart/form-data"
                  method="post">
                <!-- Form -->
                     <div class="container" style="padding:50px 0;">
                         <textarea id="txtedit"></textarea>
                     </div>
                <script>
                    $('#txtedit').Editor();
                </script>
                <div class="buttons">
                    <input type="button" class="button" value="перегляд"/>
                    <input type="submit" name="edit_blog" class="button" value="опублікувати"/>
                </div>
                <?php else :
                echo $res; ?>
            </form>
            <?php endif; ?>
        </div>
    </div>
<?php
include_once(ROOT . '/footer.php');
?>