How to Integrate Sales Fusion in SugarCRM

Hi All. How are you. Hope you all are fine.

Actually I am working on SugarCRM 6.5 Community Edition, and my client want to integrate Sales Fusion into Sugar.

Now when I follow the guide provided by Sales Fusion.

But at the time of integration Sales Fusion team said us that the URL which is given by me is giving 500 error.

So can you tell me how to solve this error.


URL is like this.
http://subdomain.mydomain.com/service/v4/soap.php

Thanks

Waiting your Reply.