[Compile Error] LNK2019 LNK1120

[baejaeho18]

g++ -std=c++11 -Wall -g -I. -c AssassinDuck.cpp -o AssassinDuck.o
In file included from Duck.h:2,
from AssassinDuck.h:2,
from AssassinDuck.cpp:1:
Bird.h:33:15: error: 'virtual void Bird::Vote(BirdList*)' cannot be overloaded with 'virtual void Bird::Vote(BirdList*)'
virtual void Vote(BirdList*) = 0;
^~~~
Bird.h:28:15: note: previous declaration 'virtual void Bird::Vote(BirdList*)'
virtual void Vote(BirdList*); // vote to the name
^~~~
make: *** [AssassinDuck.o] 오류 1

[baejaeho18]

in VS