Having problems on my office website which uses Magento ver. 2.1.8, please help

[webmasterr67ca]

Hi.. I'm having problems on my office website which uses Magento ver. 2.1.8, error occurred: 

Warning: Uncaught Exception: Warning: SessionHandler::read(): open(/home/rkmagento/site/current/var/session/sess_8o2ba7os1c42bk3ko4tjg49fe0, O_RDWR) failed: No space left on device (28) in /home/rkmagento/site/releases/201803011210/vendor/magento/framework/Session/SaveHandler/Native.php on line 22 in /home/rkmagento/site/releases/201803011210/vendor/magento/framework/App/ErrorHandler.php:61 Stack trace: #0 [internal function]: Magento\Framework\App\ErrorHandler->handler(2, 'SessionHandler:...', '/home/rkmagento...', 22, Array) #1 /home/rkmagento/site/releases/201803011210/vendor/magento/framework/Session/SaveHandler/Native.php(22): SessionHandler->read('8o2ba7os1c42bk3...') #2 /home/rkmagento/site/releases/201803011210/vendor/magento/framework/Session/SaveHandler.php(93): Magento\Framework\Session\SaveHandler\Native->read('8o2ba7os1c42bk3...') #3 [internal function]: Magento\Framework\Session\SaveHandler->read('8o2ba7os1c42bk3...') #4 /home/rkmagento/site/releases/201803011210/vendor/magento/framework/Session/SessionM in /home/rkmagento/site/releases/201803011210/vendor/magento/framework/App/ErrorHandler.php on line 61
There has been an error processing your request

Recoverable Error: session_regenerate_id(): Failed to create(read) session ID: user (path: /home/rkmagento/site/current/var/session) in /home/rkmagento/site/releases/201803011210/vendor/magento/framework/Session/SessionManager.php on line 301

Error log record number: 466061085185

What happened to my office website? please help, thank you

[toniagency82ed]

You ran out of disk space wherever your sessions are stored.

BTW. Magento 2.1.8 is ancient! You REALLY need to upgrade your Magento!

[abdurrahman_lak]

If your disk space is low then you may have to scale server resources. If you are using a managed hosting solution then resources can be easily scaled with just a click.