echo '
        <div class="panel panel-default">
            <div class="panel-heading ' . ($errorMessage ? 'error' : '') . '" role="tab" id="heading-' . self::$printResultCounter . '">
                <h4 class="panel-title">
                    <a data-toggle="collapse" data-parent="#accordion" href="#step-' . self::$printResultCounter . '" aria-expanded="false" aria-controls="step-' . self::$printResultCounter . '">
            ' . self::$printResultCounter . '. ' . $title . ($errorMessage ? ' (Failed)' : '') . '</a>
                </h4>
            </div>
            <div id="step-' . self::$printResultCounter . '" class="panel-collapse collapse" role="tabpanel" aria-labelledby="heading-' . self::$printResultCounter . '">
                <div class="panel-body">
            '

Issues