What is the rule of adding "a new header" ? Adding just an extra include completely purges compilation. What must I do when I change air.h ?

When I did everything on tutorial for windows, it compiled fine and worked ok, then I added some classes and compiled again and that worked too, but today its giving an error and I only made air.h include Aux_cl of mine. I did not touch that class or any relevant classes.

Error 1 error C2039: 'GetUserNameA' : is not a member of 'SaveInfo'

C:\Users\Tugrul_Asli\Desktop\powdertoy\The-Powder-Toy-develop\src\gui\game\GameController.cpp 1308 1 powderGPU

why is this giving error but did give any before? Also even if I slightly change air.h(adding a new include of mine "Aux_cl.h"), it says "illegal token on the right side of '::'" for the min max for bitmapbrush.h. Whats going on?

if(gameModel->GetSave() && gameModel->GetUser().ID && gameModel->GetUser().Username == gameModel->GetSave()->GetUserName())
{
Simulation * sim = gameModel->GetSimulation();
GameSave * gameSave = sim->Save();
gameSave->paused = gameModel->GetPaused();
gameSave->gravityMode = sim->gravityMode;
gameSave->airMode = sim->air->airMode;
gameSave->legacyEnable = sim->legacy_enable;
gameSave->waterEEnabled = sim->water_equal_test;
gameSave->gravityEnable = sim->grav->ngrav_enable;
gameSave->aheatEnable = sim->aheat_enable;
if(!gameSave)
{
new ErrorMessage("Error", "Unable to build save.");
}
else
{
if(gameModel->GetSave())
{
SaveInfo tempSave(*gameModel->GetSave());
tempSave.SetGameSave(gameSave);
new ServerSaveActivity(tempSave, true, new SaveUploadedCallback(this));
}
else
{
SaveInfo tempSave(0, 0, 0, 0, gameModel->GetUser().Username, "");
tempSave.SetGameSave(gameSave);
new ServerSaveActivity(tempSave, true, new SaveUploadedCallback(this));
}
}
}
else if(gameModel->GetUser().ID)
{
OpenSaveWindow();
}
else
{
new ErrorMessage("Error", "You need to login to upload saves.");
}

@jacksonmj (View Post)

Edit: solved the problem. There is another problem:

Air::Air(Simulation & simulation): is not being called by anything. I suspect air simulation is not working. Cout does not print anything to cconsole even if I flush it. Even if I run from console or msvc. Doesnt print anything.

In KernelIngredients.cpp there is only #include "KernelIngredients.h"

In KernelIngredients.h there is no inclusion

In ClKernelFactory.h there is only #include "KernelIngredients.h"

In ClKernelFactory.cpp there is only #include "ClKernelFactory.h"

In Aux_cl.cpp there is only #include "Aux_cl.h"

In Aux_cl.h there are only opencl inclusions (i wish these dont use the windows things you say :S )

In Air.h there are  #include "Aux_cl.h" and #include"ClKernelFactory.h"

How can I envelop those opencl things with #def and #undef to protect other files such from this?