What are some reasons I might be receiving this "Symbol not defined" error in Visual Studio 2005 (screenshot included)

When debugging my VS2005 project, I get the following error when I attempt to step into the function that
returns the vScenarioDescriptions local variable it's struggling with...

As I continue to walk through the code and step into functions, it appears I'm getting this error other local
variables as well. Any ideas?

Thanks in advance for your help!

From stackoverflow

• It might be a namespace issue. Try adding namespace:: before your symbol in the debugger watch window, if the symbols you're trying to watch are inside a namespace.

• Is the module compiled with optimizations turned on?

  If so, the vScenarioDescription may not actually not actually exist in memory. In VS2008 I don't get a messagebox error, the variable simply doesn't show up in the 'Locals' window, and if I try to watch it, the Watch windows says:

  CXX0017: Error: symbol "name" not found

  I don't have VS2005 installed anymore so I don't know if it pops up a messagebox like you're seeing or behaves like VS2008.

• From top of my head, there can be several:

  • The symbol information might be corrupted. Try doing a clean rebuild of the whole solution.
  • If you have multiple projects in the solution, check the Configuration Manager (Build menu) if all of them are in the Debug setting. Say, some DLLs or some components might be in the release mode that does not include any debug info.
  • If you are using some 3rd party libraries (DLL), they might have no debug info at all.