View Compilation Error

0_0_33279808_2397.cpp: In function 'int BFS(int, int)':
0_0_33279808_2397.cpp:20:23: error: 'struct point' has no member named 'x0'
   int x = que.front().x0;
                       ^
0_0_33279808_2397.cpp:21:23: error: 'struct point' has no member named 'y0'
   int y = que.front().y0;
                       ^
0_0_33279808_2397.cpp:27:28: error: 'j' was not declared in this scope
    if(!vis[x1][y1] && M[i][j] == '.'){
                            ^