Fatal error after activating conact form 7 plugin

After downloading and then activating contact form 7 plugin, I received the following fatal error. Now when I go to view my plugsin, only one is displaying even though I have 11, 9 of which are active. Would appreciate your advice.

“Fatal error: Call to undefined function wpcf7_admin_url() in /home/mel/public_html/localinternetmarketingaustralia.com/wp-content/plugins/contact-form-7-campaignmonitor-addon/cf7-campaignmonitor.php on line 253”

Thanks
Mel