Throwing errors 9/12/15

Warning: file(https://www.cacteam.com/wp-content/plugins/zstore-manager-basic/producttypes.csv): failed to open stream: HTTP request failed! HTTP/1.1 403 Forbidden in /home3/citizens/public_html/wp-content/plugins/zstore-manager-basic/zstore-manager.php on line 89

Warning: Invalid argument supplied for foreach() in /home3/citizens/public_html/wp-content/plugins/zstore-manager-basic/zstore-manager.php on line 93

Warning: session_start(): Cannot send session cache limiter – headers already sent (output started at /home3/citizens/public_html/wp-content/plugins/zstore-manager-basic/zstore-manager.php:89) in /home3/citizens/public_html/wp-content/plugins/participants-database/classes/PDb_Session.class.php on line 71

I keep my theme, plugins and everything up to date. I have made no changes to cause these errors. Help?