Solved
How to include a library into Model.cpp so that it will work also with TouchGFX simulator?
I get the following error when trying to include a .h file into Model.cpp

I get the following error when trying to include a .h file into Model.cpp

I found a solution. I added my guiData.h file under TouchGFX include and on top of Model.cpp
I included like this:
#include <gui/model/guiData.h>

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