这个关于结构的C错误是什么意思？

struct Orientation
{
    char facing;
    char sensor;
    char mazeDir;
}; 

struct Orientation O[16];
O[0] = {'N','F','N'};
O[1] = {'N','B','S'};
O[2] = {'N','R','E'};
O[3] = {'N','L','W'};
O[4] = {'S','S'};
O[5] = {'S','N'};
O[6] = {'S','W'};
O[7] = {'S','E'};
O[8] = {'E','E'};
O[9] = {'E','W'};
O[10] = {'E','S'};
O[11] = {'E','N'};
O[12] = {'W','W'};
O[13] = {'W','E'};
O[14] = {'W','N'};
O[15] = {'W','S'};

我得到关于O [13],O [14]和O [15]的这些错误

..\RMNCODE.C(282): error C231: 'O': redeFinition
..\RMNCODE.C(283): error C279: 'O': multiple initialization
..\RMNCODE.C(283): error C231: 'O': redeFinition
..\RMNCODE.C(284): error C279: 'O': multiple initialization
..\RMNCODE.C(284): error C231: 'O': redeFinition