Retriving documents from Sharepoint online by BTS2013 R2

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SharePoint2013

We are trying to retrieve documents from Sharepoint online by BTS2013 R2 but we are receiving the below error:

Error:
The adapter "Windows SharePoint Services" raised an error message. Details "The communication object, System.ServiceModel.Channels.ServiceChannel, cannot be used for communication because it is in the Faulted state.".

I have crossed checked and user credential is correct. Also the account host instances are running is having access.

We are facing couple of issues and not sure if we missed an steps to configure.

If anyone could help us or point through right documentation it would be of great help