CoursePress II - Gives warning message when not logged in as Admin

When I am logged in as an Admin, my training site works with the new CoursePress II update. When I logout (or go to the site in a Chrome Incognito session), I receive the warning: Warning: Cannot modify header information - headers already sent by (output started at C:\ws\\wp-includes\class.wp-styles.php:237) in C:\ws\\wp-content\plugins\coursepress\2.0\include\coursepress\data\shortcode\class-template.php on line 1167

The message above is from a local version of the site. I received the same message on my live site. I have restored the backup of my version of the live site with CoursePress I.

I am using Divi-builder and the WP 2017 theme. I will probably convert to Divi theme tomorrow. The only other plug-ins active are CoursePress and WPMU Dashboard. Turning off Divi-Builder did NOT clear the problem.

What do I need to do to get a fix for CoursePress II or to suppress the error message for site visitors (I prefer the fix, if possible).

I have attached the warning output.