Invalid argument supplied Error

I am getting this error when I am trying to add a new stream:

Warning: Invalid argument supplied for foreach() in /home/username/example.com/wp-content/plugins/flow-flow-social-streams/includes/FlowFlow.php on line 478

Warning: Invalid argument supplied for foreach() in /home/username/example.com/wp-content/plugins/flow-flow-social-streams/includes/FlowFlow.php on line 478

Warning: Cannot modify header information - headers already sent by (output started at /home/username/example.com/wp-content/plugins/flow-flow-social-streams/includes/FlowFlow.php:478) in /home/username/example.com/wp-includes/pluggable.php on line 1196

https://www.ads-software.com/plugins/flow-flow-social-streams/