Cannot Activate Email Communication in Membership Plugin

Hi:

I get the following message error message in my WordPress Dashboard whenever I try to active my email communications inside the Membership Plugin.

Warning: Invalid argument supplied for foreach() in /home/pedageo/public_html/wp-content/plugins/membership/membershipincludes/classes/membershipadmin.php on line 4822

Warning: Cannot modify header information - headers already sent by (output started at /home/pedageo/public_html/wp-content/plugins/membership/membershipincludes/classes/membershipadmin.php:4822) in /home/pedageo/public_html/wp-includes/pluggable.php on line 881

Can someone help me with this?

Thanks,
Shinshuri