TH3F/TH2F Histogram generated legend with a white color

ROOT
11

@couet, @dastudillo Here is my code that I did:

#include "TFile.h"
#include "TTree.h"
#include "TRandom.h"
#include "TROOT.h"
#include "TBranch.h"
#include "TH1.h"
#include "Rtypes.h"

void enAgX100_1()
{
gROOT->cd();
  THStack *hs =
    new THStack("energy",
                "Energies 0.02720 a 0.13509MeV with Ti 0.05mm with seed Agx100 of Theragnics; ELost/EKin;Counts");
  TH1F *h = new TH1F("h", "h", 100, 0.2, 1.8);
  if (h->GetSumw2N() == 0) h->Sumw2(kTRUE);
  const char *files[] = { "EnSAgX100_27keV.root",
                          "EnSAgX100_30keV.root",
                          "EnSAgX100_31_7keV.root", 
			  "EnSAgX100_35keV.root",
			  "EnSAgX100_35_5keV.root", 
			  "EnSAgX100_36keV.root",
			  "EnSAgX100_37keV.root",
			  "EnSAgX100_40keV.root",
			  "EnSAgX100_45keV.root",
			  "EnSAgX100_55keV.root",
			  "EnSAgX100_85keV.root",
			  "EnSAgX100_135keV.root" };
  const int n = sizeof(files) / sizeof(char*);
  int color = 0;
  int mycolor[i] = 0;
  for (int i = 0; i < n; i++) {
    TFile *f = TFile::Open(files[i]);
    if ((!f) || f->IsZombie()) { delete f; continue; } // just a precaution
    TTree *t; f->GetObject("GmDataTTree", t);
    if (!t) { delete f; continue; } // just a precaution
    gROOT->cd();
    t->Project("h", // each file re-fills it from scratch
               "(Event_AccumulatedEnergyLost / Event_InitialKineticEnergy)");
    /*color += 1; // "next" color color = mycolor[j];
    h->SetLineColor(color); h->SetMarkerColor(color); // do not "SetFillColor"*/
      for (int i = 0; i < n; i++) {
         color = mycolor[i];
         h->SetLineColor(color); h->SetMarkerColor(color);
      }
    h->SetTitle(files[i]);
    hs->Add((TH1F*)(h->Clone(TString::Format("h_%d", i))));
    delete f; // automatically deletes "t", too
  }
  delete h; // no longer needed
  TLegend *l = new TLegend(0.75, 0.9, 0.9, 0.25);
  for (int i = 0; i < hs->GetNhists(); i++)
    { l->AddEntry(hs->GetHists()->At(i), "", "l"); }
  hs->Draw("NOSTACK HIST");
  l->Draw();
}

What am I do wrong? In attaching the image of the error message.

Thanks!
error|690x347