CoursePress Pro Illegal string offset 'instructors'

Hello.

I am trying to add a new course (first course, actually), but unable to expand the 'instructors' section. Instead I see this message:

"Illegal string offset 'instructors' in /home/loganr22/public_html/client/trinityonlinegroups/wp-content/plugins/coursepress/2.0/include/coursepress/helper/class-utility.php on line
Warning: Illegal string offset 'instructors' in on line 149"

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Thank you!