coursepress pro update problem

I have just updated Coursepress Pro plugin and there is now an error on my site...

Warning: array_filter() expects parameter 1 to be array, string given in /var/sites/c/courses.livingroomliterature.com/public_html/wp-content/plugins/coursepress/2.0/include/coursepress/data/class-student.php on line 2004

It is showing this error on all my course pages now.

Please can you take a look.
Thanks