This is known issue in sugar crm itself, not by the plugin.
Try to access yoursugarcrm.com/soap.php?wsdl. If the page triggers error as follows
This page contains the following errors:
error on line 1215 at column 1: Extra content at the end of the document
Then you have to comment line no 51 in file sugar_root/soap.php
error_reporting(E_ALL ^ E_NOTICE); as
//error_reporting(E_ALL ^ E_NOTICE);
Now everything will work fine.