[Error(ccom)] unknown variable FRATE_CELL

Hi. I got an error while I build a project. Error: [Error(ccom)] unknown variable FRATE_CELL FRATE_CELL is defined in "headerfile.h" and I write in "sourcefile.c" => #include "headerfile.h" But I think it does not work. I dont know why. plz help me. Best regards and Thanks Minchul