I am trying to upgrade to 1.6.1 however I am getting the following errors
vendor/codeigniter/framework/system/core/compat/mbstring.php): Failed to open stream: No such file or directory
Filename: core/CodeIgniter.php
Line Number: 288
Backtrace:
When I uncomment the following line, I get HTTP500 error. Not sure why, however keep it comment it, gets me to login page. Please let me know if this is any security risk. if yes! how to fix it.