title: CodeIgniter Database Session Error
body: <p>When I try to execute any controller of my CodeIgniter project i receive this error:</p>
  
  <pre><code>Fatal error: Class CI_Session_files_driver contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (SessionHandlerInterface::read) in D:\Git\crud-farm\system\libraries\Session\drivers\Session_files_driver.php on line 49
  A PHP Error was encountered
  
  Severity: Error
  
  Message: Class CI_Session_files_driver contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (SessionHandlerInterface::read)
  
  Filename: drivers/Session_files_driver.php
  
  Line Number: 49
  
  Backtrace:
  </code></pre>
  
  <p>I tried to replace CodeIgniter system files but it didn't work. The problem appears in all projects</p>