Doesn’t work

On install it causes a fatal error

Fatal error: Uncaught Error: Call to undefined method Mailchimp::instance() in /home2/website1/public_html/wp-content/plugins/olalaweb-mailchimp-campaign-manager/class/Mailchimp.php:182 Stack trace: #0 /home2/website1/public_html/wp-content/plugins/olalaweb-mailchimp-campaign-manager/class/Mailchimp.php(186): MCC() #1 /home2/website1/public_html/wp-content/plugins/olalaweb-mailchimp-campaign-manager/mailchimp-campaigns.php(91): require_once(‘/home2/website1…’) #2 /home2/website1/public_html/wp-admin/includes/plugin.php(1897): include(‘/home2/website1…’) #3 /home2/website1/public_html/wp-admin/plugins.php(178): plugin_sandbox_scrape(‘olalaweb-mailch…’) #4 {main} thrown in /home2/website1/public_html/wp-content/plugins/olalaweb-mailchimp-campaign-manager/class/Mailchimp.php on line 182