Startup: Unable to load dynamic library '/usr/lib/php/modules/module.so'

This is cause by mcrypt extension.

Edit /etc/php.d/mcrypt.ini

and change

; Enable mcrypt extension module
extension=module.so

to this

; Enable mcrypt extension module
extension=mcrypt.so

Edit:

mini

If the directory /etc/php.d does not exist – it seems You don`t have php installed or file mcrypt.ini is in different location. Try work around.