Got Error message WHMCS Wordpress Integration

i already download the plugin and already activated it
and i create 1 page name - domain so the url is
http://www.pusatwebhosting.com/domain/

and my WHMCS location is locate at
http://www.pusatwebhosting.com/portal/

so i put in the option of whmcs wordpress integration is
Remote WHMCS host : http://www.pusatwebhosting.com/portal
Default content page: Domain
URL to encode : <not sure what it's for but i key in http://www.pusatwebhosting.com/portal/&gt;

and i try to see the results by put all value to "Domain" Pages
[wcp_welcome]

[wcp_content]

[wcp_menu]

[wcp_quick_nav]

[wcp_account]

[wcp_statistics]

but i got error message
Sorry this doesn’t look like a WHMCS site at http://www.pusatwebhosting.com/portal/ Make sure your WHMCS Integration settings are pointing to the correct URL and that the WHMCS site is set for the Portal template in Setup | General

if i go directly to http://www.pusatwebhosting.com/portal/ i can see the whmcs is working with sync to wordpress that because i'm using other wordpress plugin call templatesync. and it's successfully but it doesn't use the wordpress CSS. so i decide to use your plugin.
please assist why i got this error message at http://www.pusatwebhosting.com/domain/