Visual Studio 2013 - c++ code map error message -

Visual Studio 2013 - c++ code map error message -

i've used visual studio's 'code maps' extensively c# projects in past. i'm working on native c++ project , running problems. when add together class or method code map next error message no context or help available. ideas cause is?

error fail symbol's namespace

i should not project compiles , runs without problem.

this msdn page on code maps notes under requirements c++ has limited support.

c++ visual-studio-2013 code-map