WHMCS Integration: Protocol whmcs not supported or disabled in libcurl

Hi Guys,

Installation and implementation went fine with me
http://2host.com/new/wp/client-support-area/
But, whenever I click on any WHMCS link (client area, support tickets.....) it generates me the following error:
"WHMCS Integration: Protocol whmcs not supported or disabled in libcurl". Actually their are 2 errors this first one is "WHMCS Integration: 404—Not Found" and then comes the error cited above.
I'm wondering if you could answer me asap.