sudoku runtime error help please !!!!!

[C++ Programming]

hi ? have got a project name sudoku. ?have already write c code but something wrong ? couldn't find it .please help me !!!
#include
#include
#include
#include


#define size 9
#define size2 81
int checkingSquare( int *i,int *j,int *row,int *column,int **a);
int main(){
int i,j,row,column,controller=0;
int **a=0;


srand(time(NULL));
for(i=1;i