Fatal error

Hello,
Collabpress is just what I need, but unfortunately I can not use it!

I have this error:
“Fatal error: Call to undefined function cp_recent_activity () in / web / htdocs / intranet.anac-autori.it / home / private / wp-content / plugins / collabpress / includes / cp-core.php on line 59”

What should I do?

Also, what is the shortcode for use in the frontend?

Thank you,
Massimiliano

https://wordpress.org/plugins/collabpress/