why does my VSCode exit with code 127 when trying to compile a C file using gcc?

I’m trying to compile a C file using gcc. I’m in the right directory and all the files included in the C file i’m trying to compile is in the same directory. I can compile other files but I can’t compile files that are using this ADT Matrix. the files I have in this directory

#include <stdio.h>
#include "matrix.c"
#include <math.h>

int main(){
    int n,i,j,k,l;
    int count;
    Matrix m;

    scanf("%d", &n);
    readMatrix(&m, n, n);

    for (i=0; i<n; i++){
        for (j=0; j<n; j++){
            if (ELMT(m,i,j)==0){
                continue;
            } else 
                for (k=i+1; k<n; k++){
                    //printf("i = %d, j = %d, k = %d\n", i, j, k);
                    //printf("ELMT(k,j) = %d\n",ELMT(m,k,j));
                    if (ELMT(m,k,j)!=0){
                        count += ELMT(m,k,j);
                    }
                }
                for (k=i-1; k>=0; k--){
                    //printf("i = %d, j = %d, k = %d\n", i, j, k);
                    //printf("ELMT(k,j) = %d\n",ELMT(m,k,j));
                    if (ELMT(m,k,j)!=0){
                        count += ELMT(m,k,j);
                    }
                }
                for (k=j+1; k<n; k++){
                    //printf("i = %d, j = %d, k = %d\n", i, j, k);
                    //printf("ELMT(i,k = %d\n", ELMT(m,i,k));
                    if (ELMT(m,i,k)!=0){
                        count += ELMT(m,i,k);
                    }
                }
                for (k=j-1; k>=0; k--){
                    //printf("i = %d, j = %d, k = %d\n", i, j, k);
                    //printf("ELMT(i,k = %d\n", ELMT(m,i,k));
                    if (ELMT(m,i,k)!=0){
                        count += ELMT(m,i,k);
                    }
                }
                
        }
    }

    int mod = 1000000007;
    count = count % mod;
    printf("%d\n", count);
    //printf("%d\n", count);
    return 0;
}

this is kekacauan.c

I was expecting the code to run as usual, but it exited with code 127.

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