The clues are all there ...
you'll have to include the header for
CString
#include <atlstr.h>
COM EXE Servers will generally run for 10 mins or so after they are last used, so you'll have to kill it with task manager
When you've fixed those, you're also going to have to add a
return S_OK;
from the
DumpMessage
method (yes, i know, technically, that's my fault)
I think you may be trying to run before you can walk here ...