WHMCS blank page

Hello, Can you help me please, I did the following to activate in CWP, whmcs:

1.- Download the file cwp7.zip
2.- Create the following directories within public_html /
       WHMCS /
                 modules /
                          servers /
                                 cwp / cwp7.php
3.- I uploaded and unzipped the cwp7.zip file

enter the browser servpcspa.com/WHMCS/modules/servers/cpw7/cwp7.php
and you see blank page.

Please can you help me, thanks

Read more here https://wiki.centos-webpanel.com/whmcs-module-for-cwp-api