Ошибка в линковке (С++) - Public forum of MSU united student networks

Помогите, плиз!

Собираю проект в Студии 2003, выдаются вот такие ошибки, совсем не понимаю, что это значит, не сталкивалась раньше... Как это можно попробовать исправить? с чем связана ошибка? :crazy:

MSDN не помог...

Population.obj : error LNK2005: "float __cdecl Generate_rand(int)" (?Generate_rand@@YAMH@Z) already defined in main.obj
Population.obj : error LNK2005: "int __cdecl Generate_rand_N(int)" (?Generate_rand_N@@YAHH@Z) already defined in main.obj
Population.obj : error LNK2005: "int __cdecl Generate_place(int)" (?Generate_place@@YAHH@Z) already defined in main.obj
Population.obj : error LNK2005: "public: class GENOM __thiscall GENOM::operator=(class GENOM)" (??4GENOM@@QAE?AV0@V0@@Z) already defined in main.obj
Population.obj : error LNK2005: "public: int __thiscall GENOM::operator==(class GENOM)" (??8GENOM@@QAEHV0@@Z) already defined in main.obj
Population.obj : error LNK2005: "public: short __thiscall GENOM::reverse_A(void)" (?reverse_A@GENOM@@QAEFXZ) already defined in main.obj
Population.obj : error LNK2005: "public: short __thiscall GENOM::reverse_G(void)" (?reverse_G@GENOM@@QAEFXZ) already defined in main.obj
Population.obj : error LNK2005: "public: short __thiscall GENOM::reverse_T(void)" (?reverse_T@GENOM@@QAEFXZ) already defined in main.obj
Population.obj : error LNK2005: "public: short __thiscall GENOM::reverse_C(void)" (?reverse_C@GENOM@@QAEFXZ) already defined in main.obj
Population.obj : error LNK2005: "public: void __thiscall GENOM::mutation(void)" (?mutation@GENOM@@QAEXXZ) already defined in main.obj
Population.obj : error LNK2005: "public: void __thiscall GENOM::show(void)" (?show@GENOM@@QAEXXZ) already defined in main.obj
Population.obj : error LNK2005: "public: void __thiscall CELL::transformation(void)" (?transformation@CELL@@QAEXXZ) already defined in main.obj
Population.obj : error LNK2005: "public: bool __thiscall CELL::WT(class GENOM)" (?WT@CELL@@QAE_NVGENOM@@@Z) already defined in main.obj
Population.obj : error LNK2005: "public: bool __thiscall CELL::M41L(class GENOM)" (?M41L@CELL@@QAE_NVGENOM@@@Z) already defined in main.obj
Population.obj : error LNK2005: "public: bool __thiscall CELL::T215N(class GENOM)" (?T215N@CELL@@QAE_NVGENOM@@@Z) already defined in main.obj
Population.obj : error LNK2005: "public: bool __thiscall CELL::T215S(class GENOM)" (?T215S@CELL@@QAE_NVGENOM@@@Z) already defined in main.obj
Population.obj : error LNK2005: "public: bool __thiscall CELL::T215Y(class GENOM)" (?T215Y@CELL@@QAE_NVGENOM@@@Z) already defined in main.obj
Population.obj : error LNK2005: "public: bool __thiscall CELL::fitness_bool_value(class GENOM)" (?fitness_bool_value@CELL@@QAE_NVGENOM@@@Z) already defined in main.obj
Population.obj : error LNK2005: "public: int __thiscall CELL::survival_quantity(void)" (?survival_quantity@CELL@@QAEHXZ) already defined in main.obj
Population.obj : error LNK2005: "public: void __thiscall CELL::fitness(void)" (?fitness@CELL@@QAEXXZ) already defined in main.obj
Population.obj : error LNK2005: "public: void __thiscall VIRAL_POPULATION::copy_new_to_start(void)" (?copy_new_to_start@VIRAL_POPULATION@@QAEXXZ) already defined in main.obj
Population.obj : error LNK2005: "public: void __thiscall VIRAL_POPULATION::copy_viruses(class SWAP_CELL)" (?copy_viruses@VIRAL_POPULATION@@QAEXVSWAP_CELL@@@Z) already defined in main.obj
Population.obj : error LNK2005: "public: void __thiscall VIRAL_POPULATION::selection(void)" (?selection@VIRAL_POPULATION@@QAEXXZ) already defined in main.obj
Population.obj : error LNK2005: "public: void __thiscall CELL_POPULATION::copy_viruses(class VIRAL_POPULATION)" (?copy_viruses@CELL_POPULATION@@QAEXVVIRAL_POPULATION@@@Z) already defined in main.obj
Population.obj : error LNK2005: "public: void __thiscall CELL_POPULATION::handle_cells(void)" (?handle_cells@CELL_POPULATION@@QAEXXZ) already defined in main.obj
Debug/12042009.exe : fatal error LNK1169: one or more multiply defined symbols found