Object of type CodeUnit with id 6810 could not be found.

I installed a second web service server tier (not a second RTC tier) in order to try out a few different things, and I am getting a strange error. I created a codeunit with a single "Hello World!" function, published it, and I then created a Visual Studio 2008 console application project, added the web reference, etc. etc.

However, when I run the console application from the Visual Studio debugger, here is the error message I get from the Hello World function:

Metadata for object of type CodeUnit with id 6810 is in a failed state.  This is caused by a previous exception: 

Object of type CodeUnit with id 6810 could not be found.

Does anyone have a fix for this? I imagine it has something to do with the fact that this is a second install of the web service server tier.

I am using NAV 2009 R2. The server components for employee portal are installed on the server and are compiled, but I do not use them in my test codeunit here (the test codeunit is in a standard Cronus database and is the only modified object). I have done development and installation for the web service tier before, but I have never had this problem (although this is the first time I've installed a second instance of it).

BTW - why did Microsoft give so many options to install a second web service/rtc tier but have the option to decide between the two be a simple "WS" at the end of the service name instead of an option during the install???? Bizarre!