sayan@sayan-HP-Pavilion-Notebook:~/Tools/ZDECAY$ ./Example7 output3.root 

 *** Break *** segmentation violation



===========================================================
There was a crash.
This is the entire stack trace of all threads:
===========================================================
#0  0x00007f1ac796e687 in __GI___waitpid (pid=16706, stat_loc=stat_loc
entry=0x7ffcd5c9b968, options=options
entry=0) at ../sysdeps/unix/sysv/linux/waitpid.c:30
#1  0x00007f1ac78d9067 in do_system (line=<optimized out>) at ../sysdeps/posix/system.c:149
#2  0x00007f1ac93a22f7 in TUnixSystem::Exec (shellcmd=<optimized out>, this=0x555e706277c0) at /home/sayan/Downloads/root-6.12.06/core/unix/src/TUnixSystem.cxx:2118
#3  TUnixSystem::StackTrace (this=0x555e706277c0) at /home/sayan/Downloads/root-6.12.06/core/unix/src/TUnixSystem.cxx:2412
#4  0x00007f1ac93a4a1c in TUnixSystem::DispatchSignals (this=0x555e706277c0, sig=kSigSegmentationViolation) at /home/sayan/Downloads/root-6.12.06/core/unix/src/TUnixSystem.cxx:3643
#5  <signal handler called>
#6  0x00007f1ac92bdd7b in TString::operator= (this=this
entry=0x7ffcd5c9e5e0, cs=cs
entry=0x2 <error: Cannot access memory at address 0x2>) at /home/sayan/Downloads/root-6.12.06/core/base/src/TString.cxx:271
#7  0x00007f1ac8853617 in TChain::ParseTreeFilename (this=this
entry=0x7ffcd5c9e770, name=name
entry=0x2 <error: Cannot access memory at address 0x2>, filename=..., treename=..., query=..., suffix=...) at /home/sayan/Downloads/root-6.12.06/tree/tree/src/TChain.cxx:2091
#8  0x00007f1ac8853aa9 in TChain::Add (this=0x7ffcd5c9e770, name=0x2 <error: Cannot access memory at address 0x2>, nentries=9223372036854775807) at /home/sayan/Downloads/root-6.12.06/tree/tree/src/TChain.cxx:339
#9  0x0000555e6f94fc4c in main ()
===========================================================


The lines below might hint at the cause of the crash.
You may get help by asking at the ROOT forum http://root.cern.ch/forum.
Only if you are really convinced it is a bug in ROOT then please submit a
report at http://root.cern.ch/bugs. Please post the ENTIRE stack trace
from above as an attachment in addition to anything else
that might help us fixing this issue.
===========================================================
#6  0x00007f1ac92bdd7b in TString::operator= (this=this
entry=0x7ffcd5c9e5e0, cs=cs
entry=0x2 <error: Cannot access memory at address 0x2>) at /home/sayan/Downloads/root-6.12.06/core/base/src/TString.cxx:271
#7  0x00007f1ac8853617 in TChain::ParseTreeFilename (this=this
entry=0x7ffcd5c9e770, name=name
entry=0x2 <error: Cannot access memory at address 0x2>, filename=..., treename=..., query=..., suffix=...) at /home/sayan/Downloads/root-6.12.06/tree/tree/src/TChain.cxx:2091
#8  0x00007f1ac8853aa9 in TChain::Add (this=0x7ffcd5c9e770, name=0x2 <error: Cannot access memory at address 0x2>, nentries=9223372036854775807) at /home/sayan/Downloads/root-6.12.06/tree/tree/src/TChain.cxx:339
#9  0x0000555e6f94fc4c in main ()
===========================================================