New WPBlacklist 2.9 error

I have been using WPBlacklist successfully for about 8 months or so. Just recently when someone makes a comment, an error screen ensues, but th ecomment does get posted. The error screen is as follows:

arning: preg_match(): Compilation failed: unmatched parentheses at offset 13 in /home/splendid/public_html/wp/wp-content/plugins/blacklist.php on line 163

Warning: preg_match(): Compilation failed: unmatched parentheses at offset 13 in /home/splendid/public_html/wp/wp-content/plugins/blacklist.php on line 172

Warning: preg_match(): Compilation failed: unmatched parentheses at offset 13 in /home/splendid/public_html/wp/wp-content/plugins/blacklist.php on line 181

Etc….

Any insite would be helpful.