Need a web programmer to launch a backup of the Joomla website on the hosting nic.ru

The website for many years lay on the hosting Center. Then changes happened and we were hosting nic.ru. The website was rolled up in resinous copy. Attempted to run on the new hosting this old site, the database gives an error : Warning: session_start(): Failed to read session data: user (path: /tmp) in /home/h003313449/kfioran.ru/docs/libraries/joomla/session/session.php on line 654
Error displaying the error page: Application Instantiation Error
At an impasse, we need knowledge web programmer