Fatal error: Uncaught Zend_Cache_Exception: cache_dir "/var/www/clients/client1/web1/web/var/cache/" is not writable in /var/www/clients/client1/web1/web/vendor/magento/zendframework1/library/Zend/Cache.php:209
Stack trace:
#0 /var/www/clients/client1/web1/web/vendor/magento/zendframework1/library/Zend/Cache/Backend/File.php(180): Zend_Cache::throwException('cache_dir "/var...')
#1 /var/www/clients/client1/web1/web/vendor/colinmollenhour/cache-backend-file/File.php(86): Zend_Cache_Backend_File->setCacheDir('/var/www/client...')
#2 /var/www/clients/client1/web1/web/vendor/magento/zendframework1/library/Zend/Cache.php(153): Cm_Cache_Backend_File->__construct(Array)
#3 /var/www/clients/client1/web1/web/vendor/magento/zendframework1/library/Zend/Cache.php(94): Zend_Cache::_makeBackend('Cm_Cache_Backen...', Array, true, true)
#4 /var/www/clients/client1/web1/web/vendor/magento/framework/App/Cache/Frontend/Factory.php(156): Zend_Cache::factory('Magento\\Framewo...', 'Cm_Cache_Backen...', Array, Array, true, true, true)
#5 /var/ in /var/www/clients/client1/web1/web/vendor/magento/zendframework1/library/Zend/Cache.php on line 209