Currently, your C18 can not find the header file 'p18cxxx.h' in the include path:
/i"C:\Archivos de programa\MCC18\mcc18\src\inc" you gave it.
That path should read: /i"C:\Archivos de programa\MCC18\mcc18\h", and you can do that by going to Project > Build Options ... > Project, and tab General, browse to that folder for the Include Path, ($INCDIR) text field.
The options in the your image are for optimizations.
No, you don't need the folder called 'inc' (apparently, it does not exist).
You need to use the Browse button, and browse to the folder named 'h', in your mcc18 folder. In my computer, it looks like: 'D:\Microchip\MCC18\h'. It is the folder of header files (.h files).