root [0] .x plotter_stack.C
Error in <TFile::TFile>: file RootFiles/A1/hist-data-output.root does not exist
Error in <TFile::TFile>: file RootFiles/A2/hist-data-output.root does not exist
Error in <TFile::TFile>: file RootFiles/A3/hist-data-output.root does not exist
Nevermind, I see that you set the minimum to 0. That can be the problem because Log(0) is undefined.
try a small value instead. Like 0.001