I am having the same problem(or seems to be the same error) as in this article but I not sure where to check for this.
I am using sharepoint 2010 and made a custom workflow through Visual Studios 2010.
I cannot find what they are talking about.
The option discussed in the article is part of the Workflow Association process when you configure a workflow on a list or library. The first screen (which is standard for all workflows) has an option where you can set that the workflow completion also sets content approval (its just a checkbox) on the same form where you define if you wnat the workflow to start manually, automatically, etc.