INVALID_SESSION Error

Sorry if this is simple, I am just getting into TeamSite WorkflowBuilder. I am able to connect to the TS server find with WorkflowBuilder but when I try to upload a new workflow (a copy of an existing one), I receive back "Invalid Session" which, according to the book equates to "INVALID_SESSION". That doesn't tell me much! I searched all over and can find no hint as to what the problem might be. Any ideas?

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