Fatal error: Class CI_Session_files_driver contains 1 abstract method and must there

The class in question has been modified, and it shouldn't be - nothing under system/ should be manually modified.

Download CodeIgniter again and replace your system/ directory with a fresh one.

Hello NARF I have a same issue do you have any other condition or situation to resolve this issue please provide me. and please tell me what kind of issue is that.

iRfan