PHP module "Multibyte String" is missing

When install phpFox, you have to meet some module requirements. One of them is Multibyte String, or you will encounter this error.

To solve this, you need to install module Multibyte String to your system. Below is the command to install on CentOS Release 6.9 (Final)

yum install ea-php56-php-mbstring.x86_64

If you see the result: 

Installed:
ea-php56-php-mbstring.x86_64 0:5.6.31-5.5.1.cpanel                                   
Complete!

Then you installed Multibyte String properly.

You need restart server to apply changes:

service httpd restart