The working directory does not exist

Nevermind, I got it. It was so simple, I'm sorry for wasting anyone's time.

The source Solution had a lot of Projects under them. I figured at least one of them was pointing to a directory that doesn't exist, so I waded through the Projects,

• I right-clicked a Project and clicked the Properties
• This will open up the ProjectName Property Tab
• Under the Debug tab, there is a filed called "Working Directory"; I changed it to where the project is currently located.

This solved my problem, for now, unless there's a Project I missed. I am wondering, though, if I have to do this again if I move the Solution elsewhere.