Getting Error Warning: Cannot modify header information – headers already sent

Hello there.
After I use the shortcode in my post and I click on update I get the follow error on the backend:

Warning: Cannot modify header information – headers already sent by (output started at /home/stampiam/public_html/wp-content/plugins/amazon-associates-link-builder/lib/php/aalb_tracking_api_helper.php:116) in /home/stampiam/public_html/wp-admin/post.php on line 242

The frontend works well. I get the error only after I click on update on the post.

Can somebody help me ?