Bootlint is complaining that my bootstrap col isn’t a child of a row—but it is?

When I run the bootlint bookmarklet or extension it give me this error:

Columns (`.col-*-*`) can only be children of `.row`s or `.form-group`s

but my column is the direct child of a row. This is basically the whole page, minus a few dotpoints. What am I missing? Is it because I’m using version 3?

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>foo</title>
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css">
</head>
<body>
<div class="container">
    <div class"row">
        <div class="col-md-12">
            <h1>
                bar
            </h1>
            <ul>
            [snip]
            </ul>
        </div>
    </div>
</div>
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js">
</script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.min.js">
</script>
</body>
</html>