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MPI communicator error
#include <iostream>
#include <cstdlib>
#include <mpi.h>

#define RNumber     3

using namespace std;

int main() {
    /*Initiliaze MPI*/
    int     my_rank;    //My process rank
    int         comm_sz;    //Number of processes
    MPI_Comm    GathComm;   //Communicator for MPI_Gather
    MPI_Init(NULL, NULL);
    MPI_Comm_rank(MPI_COMM_WORLD, &my_rank);
    MPI_Comm_size(MPI_COMM_WORLD, &comm_sz);

    /*Initialize an array for results*/
    long rawT[RNumber];
    long * Times = NULL;        //Results from threads
    if (my_rank == 0) Times = (long*) malloc(comm_sz*RNumber*sizeof(long));

    /*Fill rawT with results at threads*/
    for (int i = 0; i < RNumber; i++) {
        rawT[i] = i;
    }


    if (my_rank == 0) {
        /*Main thread recieves data from other threads*/
        MPI_Gather(rawT, RNumber, MPI_LONG, Times, RNumber, MPI_LONG, 0, GathComm);

    }
    else {
        /*Other threads send calculation results to main thread*/
        MPI_Gather(rawT, RNumber, MPI_LONG, Times, RNumber, MPI_LONG, 0, GathComm);
    }

    /*Finalize MPI*/
    MPI_Finalize();
    return 0;
};