Rebin histogram error

Hi all;
I want to rebin my histogram, I have the following lines of code below, the rebin does not work:
warning: implicit conversion from ‘double’ to ‘Int_t’ (aka ‘int’) changes value from 0.5 to 0 [-Wliteral-conversion]
~~~~~ ^~~

Applying ATLAS style settings…

Warning in TCanvas::Constructor: Deleting canvas with same name: can
Error in TH1F::Rebin: Illegal value of ngroup=0

TFile *f_0 = new TFile("myfile.root");

TH1F h_0 = (TH1F)gDirectory->Get(“h_pt_mu1”);

Maybe you want: h_0->Rebin(2); // merges two bins in one

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