Build issue

[C# Programming]

The current Solution I'm working on has 19 projects at the moment and there are another 4 on the way. Because of the size of the solution and because build times are beyond annoying and for to simplify traces and a plethora of other reasons, projects that are not involved directly in the current cycle of development and testing are unloaded. This worked like a charm until yesterday evening when a new project was added, along with its own configuration (there are 9 configurations at the moment, I added another 2 last night and eventually there will be 15).

I get this error message when I build:

Error 1 The OutputPath property is not set for this project. Please check to make sure that you have specified a valid Configuration/Platform combination. Configuration='Radiology' Platform='AnyCPU' AppChooser


Now, I've figured out the reason is because I've unloaded the two project being referenced. Reloading them (which brings me back to the complete list of projects) makes the build go perfectly fine.

Googling has shown that others have faced similar problems, I just couldn't find any solutions or workarounds.


Suggestions?

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Current activities:
Book: Devils by Fyodor Dostoyevsky
Project: Hospital Automation, final stage
Learning: Image analysis, LINQ

Now and forever, defiant to the end.
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