Fatal error on activation in …/cleverness-to-do-list-widget.class.php:256

Got the following error after attempting to install:

Plugin could not be activated because it triggered a fatal error.

Fatal error: Uncaught Error: Call to undefined function create_function() in /FULLFOLDERPATH/wp-content/plugins/cleverness-to-do-list/includes/cleverness-to-do-list-widget.class.php:256 Stack trace: #0 /FULLFOLDERPATH/wp-content/plugins/cleverness-to-do-list/cleverness-to-do-list.php(21): include_once() #1 /FULLFOLDERPATH/wp-admin/includes/plugin.php(2288): include_once('/home/dh_iwvd88...') #2 /FULLFOLDERPATH/wp-admin/plugins.php(192): plugin_sandbox_scrape('cleverness-to-d...') #3 {main} thrown in /FULLFOLDERPATH/wp-content/plugins/cleverness-to-do-list/includes/cleverness-to-do-list-widget.class.php on line 256