I sent you a question via your site's chat almost a month ago but you never got back to me.. I get an email for all sites on which WPCompress is installed, because:

WordPress has a built-in feature that detects when a plugin or theme causes a fatal error on your site, and notifies you with this automated email. In this case, WordPress caught an error with one of your plugins, WP Compress | Image Optimizer.

Could you please get back to me? Does this mean your plugin is currently unsafe with the latest Wordpress? In the message I sent you on September 18th there are the details of the error..