Strange error when I want to import data into TMVA classification module

TMVA
1

Hi.all
When I try to use signal and background data in TMVAClassificatin.C file. I come across a strange error.Shown below the image.I debug and retry the input data a lot .But it still can not work.How can I sovle this probelm .Many thanks.

c94a991eadf5b6c4e17dbf8888842d2
c94a991eadf5b6c4e17dbf8888842d2800×221 23.6 KB

5d52b15a59f8ef7197e2ce2004c71b6
5d52b15a59f8ef7197e2ce2004c71b6644×745 134 KB

2

Hi,
Are you sure your input TTree’s contain a branch (variable) with name "a" ?
It looks like the variable is not present and this causes this error

Lorenzo

3

I finally find the tiny bug,I use two different variables in signal (a) and backgroud (a2) trees,which leads to such error information .Thanks so much !!