e-Newsletter is generating error on Create Newsletter page

I have e-Newsletter configured and ready to go, but I can’t visit the Create Newsletter page:slight_smile: I get the following error (the page won’t load at all):

Fatal error: Class ‘Genesis_Admin_Boxes’ not found in /home/bulletproofmarke/public_html/wp-content/plugins/wpstudio-testimonial-slider/inc/gts-admin.php on line 16

This appears to clearly be a plugin conflict. The testimonials plugin is a fairly integral part of my home page. Is there any way to get it working? Any insight is much appreciated.