TTree branch Accessing

ROOT
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Dear Root Forum users,
I am Getting the following error when accessing a branch in tree. I have attached the root file and .cc file… I I want to draw the branch hit_eta_vec inside the myTree in the file.
Thanks in Advance

Error :in <HandleInterpreterException>: Trying to dereference null pointer or trying to call routine taking non-null arguments.
Execution of your code was aborted.
In file included from input_line_10:1:
/afs/cern.ch/work/s/shahzad/Per_EVent_Analysis/run/Ntuple_Analysis/Muons/Read1.cc:17: 4: warning: null passed to a callee that requires a non-null argument [-Wnonnull]
Read1.cc (1.1 KB)
TEST.root (29.5 KB)

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If you don’t know how to deal with your tree, see how various flavours of automatically generated “analysis skeletons” deal with it.

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