Commented Unassigned: Sharepoint List Source:EndpointNotFoundException [21942]

Hi , trying to set up a Sharpoint List Source for the first time. Following the docs and filled in the parameters. Copied and pasted URL from Sharepoint location bar. Clicked refresh, got EndpointNotFoundException.

[EndpointNotFoundException](http://snag.gy/By5vx.jpg)

What am I doing wrong?
Comments: ** Comment from web user: prodevx **

Thank you