I haven't changed my system, so I think I missed some kind of an update.
When I go through to generate my letters, I get the following error: An error has occurred. (InternalError) Include this Error Id if you contact Nintex Support: 04c2f2c3-d173-4205-afa9-f2253759afdc. If you have made any recent modifications, try refreshing the component and run again.
When I scroll to the bottom of the page, it tells me that "This DocGen Package will be available for users in the categories below only if the DocGen component was added to the starting object's page." and then it lists a number of permission sets, profiles, and roles.