Plugin Socialable – Fatal error line 1181

When I try to activite the plugin I receive the following error message:

Warning: main() [function.main]: open_basedir restriction in effect. File(/yoast-posts.php) is not within the allowed path(s): (/var/www/vhosts/accendotraders.com/subdomains/blog/httpdocs:/tmp) in /var/www/vhosts/accendotraders.com/subdomains/blog/httpdocs/wp-content/plugins/sociable/sociable.php on line 1181

Warning: main(yoast-posts.php) [function.main]: failed to open stream: Operation not permitted in /var/www/vhosts/accendotraders.com/subdomains/blog/httpdocs/wp-content/plugins/sociable/sociable.php on line 1181

Fatal error: main() [function.require]: Failed opening required ‘yoast-posts.php’ (include_path=’.:’) in /var/www/vhosts/accendotraders.com/subdomains/blog/httpdocs/wp-content/plugins/sociable/sociable.php on line 1181

This happened when I upgraded to 2.7