[Plugin: Flexo Facebook Manager] New update giving php errors…

Hello! I just updated this plugin and am now getting this error…

Warning: Cannot modify header information – headers already sent by (output started at /home/content/xxxxxxx/wp-content/plugins/flexo-facebook-manager/flexo-facebook-manager.php:1) in /home/xxxxxx/wp-includes/pluggable.php on line 866

I’ve deactivated it for now but would really like to turn it back on. ?? Any ideas?

https://www.ads-software.com/extend/plugins/flexo-facebook-manager/