Object reference not set to an instance of an object. Test Connection

I got the below error message when I tried to add connection to Qlik Sense server, my version is QSDA PRO 1.7.5, installed on enterprise server, connection type NTLM and WINDOWS.

Object reference not set to an instance of an object.

Did you receive this during testing the connection? I suggest you open a support ticket at http://support,easyqilik.com so you can share log files with me.

-Rob