public static function report_errors()
    {
        $invalid = Sputnik::get_invalid();
        if (empty($invalid)) {
            return;
        }
        ?>
	<div class="error"><p><?php 
        _e('The following plugins are disabled:', 'wpsc');
        ?>
</p>
	<ul>
<?php 
        foreach ($invalid as $plugin) {
            if (empty($plugin['sputnik_error'])) {
                $plugin['sputnik_error'] = 'unknown';
            }
            switch ($plugin['sputnik_error']) {
                case 'not_purchased':
                    $error = __('Not purchased', 'wpsc');
                    break;
                default:
                    $error = __('Unknown error', 'wpsc');
                    break;
            }
            ?>
		<li><?php 
            echo esc_html($plugin['Name']);
            ?>
 &mdash; <?php 
            echo $error;
            ?>
</li>
<?php 
        }
        ?>
	</ul>
	</div>
<?php 
    }