Cron error

Hi,

I just started a new site using the latest CMSB, setting the cron job on my server.

Fatal error: Uncaught TypeError: is_dir(): Argument #1 ($filename) must be of type string, null given in /home/users/0/xxx/web/maris/cmsb/lib/Server.php:188

Somehow, it was sending me error mails, so I tried running manualy.

The last line seems to be an error.

cron_dispatcher_process(): Argument #2 ($cronLastRunTime) must be of type int, string given, called in /home/users/0/xxx/web/maris/cmsb/cron.php on line 115 in /home/users/0/xxx/web/maris/cmsb/cron.php on line 115

What can I do for this? 

Thank you,

HIroko