That should be unrelated to OptiX and would happen for any application built with a release target when starting it from within the Visual Studio debugger.
I’m assuming the application itself works anyway if you ignore that message or when starting directly from a command prompt or from within the Visual Studio debugger with Menu->Debug->Start Without Debugging (Ctrl+F5).
To get rid of the warning and to be able to debug through the OptiX SDK examples host code (*.c; *.cpp) you would need to build the SDK examples yourself with the Debug x64 target.
(Sidenote for your own projects later: Note that all PTX device code which is sent to OptiX for the different program domains should not contain debug information though (no nvcc -g or -G options). The CMake build scripts inside the OptiX SDK take care of that.)