<div class="error-block">
    <h2>Import errors</h2>
    <div class="error-accordion">
        @foreach(\Session::get('error_data') as $error_line)
            <div class="collapse">
            <h3>Product: {!!$error_line['reference']!!}</h3>
                <ul class="collapsible-ul">
                    @foreach($error_line['errors'] as $error)
                        <li>{!!$error!!}</li>
                    @endforeach
                </ul>
            </div>
        @endforeach
    </div>
</div>