Coursepress Pro messes up my system

Did a fresh reinstall of wordpress so there's no extra files. i installed coursepress pro via the dashboard and got this on a blank white page.
"
Fatal error: Can't use function return value in write context in /home/t/public_html/wp-content/plugins/coursepress/2.0/include/coursepress/data/shortcode/class-coursetemplate.php on line 425
"

HELP pleaaase this is mission critical!