It appears the latest update included displaying error messages. Those error messages are from other plugin.
I had the same issue and the fix (until the author pushes another update) is to remove the line:
error_reporting(E_ALL); ini_set(‘display_errors’, ‘1’);
I created some instructions here https://www.businesslegions.com/blog/2016/01/15/fix-nextscript-social-networks-auto-poster-error-messages/