CodeIgniter Database Session Error
<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>