subscribe by email plugin is generating error

I just tried to install the update to subscribe by email and it caused the site to crash. this is what is generating in my error log:

5-Jul-2013 20:33:02 UTC] PHP Fatal error: Call to undefined function get_blog_details() in /home2/bnmnewpr/public_html/zonyebarjean/wp-content/plugins/subscribe-by-email/subscribe-by-email.php on line 142
[05-Jul-2013 20:33:25 UTC] PHP Fatal error: Call to undefined function get_blog_details() in /home2/bnmnewpr/public_html/zonyebarjean/wp-content/plugins/subscribe-by-email/subscribe-by-email.php on line 142
[05-Jul-2013 20:36:15 UTC] PHP Fatal error: Call to undefined function get_blog_details() in /home2/bnmnewpr/public_html/zonyebarjean/wp-content/plugins/subscribe-by-email/subscribe-by-email.php on line 142
[05-Jul-2013 20:38:06 UTC] PHP Fatal error: Call to undefined function get_blog_details() in /home2/bnmnewpr/public_html/zonyebarjean/wp-content/plugins/subscribe-by-email/subscribe-by-email.php on line 142
[05-Jul-2013 20:40:27 UTC] PHP Fatal error: Call to undefined function get_blog_details() in /home2/bnmnewpr/public_html/zonyebarjean/wp-content/plugins/subscribe-by-email/subscribe-by-email.php on line 142
[05-Jul-2013 20:40:37 UTC] PHP Fatal error: Call to undefined function get_blog_details() in /home2/bnmnewpr/public_html/zonyebarjean/wp-content/plugins/subscribe-by-email/subscribe-by-email.php on line 142