This error message occurs when a Salesforce User does not have their DocuSign credentials entered on their User record. 

What to do

When running a Conga routine involving DocuSign and Composer in background mode (DS7/Workflow/Conductor), a complete DocuSign password must be current on the User Profile in Salesforce.

If a version of DocuSign is upgraded, the Password for the Salesforce User Profile must be re-entered.