Database Error: Out of memory

After the update to 2.16.2 I got a database error. Then I restored the old version, but anyway this failure is still available.

Fatal error: Out of memory (allocated 28049408) (tried to allocate 40 bytes) in /homepages/2/dxxxxxxxx/htdocs/Piwik/vendor/leafo/lessphp/ on line 317

Fatal error: Call to undefined method Piwik\Plugin\Segment::setRequiresAtLeastViewAccess() in /homepages/2/dxxxxxxx/htdocs/Piwik/plugins/CoreHome/Columns/VisitorId.php on line 33

Fatal error: Out of memory (allocated 27787264) (tried to allocate 20 bytes) in /homepages/2/dxxxxxxxx/htdocs/Piwik/vendor/leafo/lessphp/ on line 324

What does this message mean. What is to do ?

PHP is out of memory. See here: How to Set up Auto-Archiving of Your Reports - Analytics Platform - Matomo

My provider don’t allow me to change this settings. The App works fine, but the browser send this error message.