وقتی دایرکت ادمین نصب میکنیم این ارور میاد

Cannot find /etc/sysconfig/rhn/up2date... up2date may break things.
*** flex is required for compiling php, please install flex (yum install flex)***
Installation didn't pass, halting install.
Once requirements are met, run the following to continue the install:
cd /usr/local/directadmin/scripts
./install.sh

Common pre-install commands:
Common pre-install commands

بعد از زدن لایسنس ایدی و کلینت