Error message on my blog

When I activate this plugin on my blog I get the following error message:

Parse error: syntax error, unexpected T_DNUMBER in /home/careerde/public_html/wp-content/plugins/wpmu-dev-seo/wds-files/wds-autolinks/wds-autolinks.php(265) : regexp code on line 1

Fatal error: preg_replace() [function.preg-replace]: Failed evaluating code: '<h1>'.2.'</h1>' in /home/careerde/public_html/wp-content/plugins/wpmu-dev-seo/wds-files/wds-autolinks/wds-autolinks.php on line 265