fix joomla site

I am in need of a Joomla expert to fix errors on my website. This is what I find in the error logfile:
[Mon Jun 05 11:49:06.109916 2023] [proxy_fcgi:error] [pid 1620480] [client 2a03:2880:31ff:15::face:b00c:0] AH01071: Got error 'PHP message: PHP Warning: session_start(): open( /var/www/vhosts/divertimento-drenthe.nl/domains/divertimento-drenthe.nl/public_html/libraries/joomla/session/sess_ubel56ik5p13hj6mlpd8eatfdp, O_RDWR) failed: No such file or directory (2) in /var/www/vhosts/divertimento-drenthe.nl/domains/divertimento-drenthe.nl/public_html/libraries/joomla/session/handler/native.php on line 260PHP message: PHP Warning: session_start(): Failed to read session data: files (path: /var/www/vhosts/divertimento-drenthe.nl/domains/divertimento-drenthe.nl/public_html/libraries/joomla/session) in /var/www/vhosts/divertimento-drenthe.nl/domains/divertimento-drenthe.nl/public_html/libraries/joomla/session/handler/native.php on line 260'

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