Warning in php code

I’ve installed the plugin, but I receive this warning in the configuration:
Warning: array_pad() expects exactly 3 parameters, 2 given in /home/…/wp-content/plugins/multi-rss-reader-widet/Multi-RSS-Reader.php on line 671

And on my blog in each page with the widget I see this error:
Warning: preg_match(): Empty regular expression in /home/pastryssima/…/plugins/multi-rss-reader-widet/Multi-RSS-Reader.php on line 471

http://wordpress.org/plugins/multi-rss-reader-widet/