Problem with TGraphError

I have a problem with my root’s macro, after it run i have this message:
Error in TGraphErrors::TGrapherrors: Cannot open file: delta_Pace1_test_88_140_153_128_128.dat, TGraphErrors is Zombie
I don’t kown why…

For some reason TGrapheEror failed to open this file.
Can you send a small example reproducing your problem ?

Thanks , but i solved my problem.