<u>Webservices First</u><br />
I had to install and/or update and enable the Webservices plugin first. I don't know if it was a coincidence or not, but things started working after I did clean install of the Fusioninventory plugin after installing Webservices.
*Hint: If you find that Web Services will not install due to some error, (in my case is was some "incompatible PHP error" or something) restart your Apache services
<code>service httpd restart</code>
<u>Fusioninventory Plugins</u><br />