Are you sure that the wri-pro.php file is the original file without any modification, and this file begins with
<?php? The error message says, that something is written in the first line of wri-pro.php.
Please download the plugin again, delete the whole directory of the plugin, and install it again.
I hope, this will solve the problem.
- This reply was modified 6 years, 2 months ago by WebshopLogic.