Issue while showering NLO events with NLO

[rash-eng]

I tried to shower events for the NLO process p p > t t~ [QCD].
But I am getting the following error.

INFO: Generating events
INFO: Idle: 0, Running: 3, Completed: 2 [ current time: 10h38 ]
INFO: Idle: 0, Running: 2, Completed: 3 [ current time: 10h38 ]
INFO: Idle: 0, Running: 1, Completed: 4 [ 3.8s ]
INFO: Idle: 0, Running: 0, Completed: 5 [ 3.9s ]
sum of cpu time of last step: 0 second
INFO: Doing reweight
INFO: Idle: 0, Running: 2, Completed: 3 [ current time: 10h39 ]
INFO: Idle: 0, Running: 1, Completed: 4 [ 0.16s ]
INFO: Idle: 0, Running: 0, Completed: 5 [ 0.17s ]
INFO: Collecting events
INFO:

  Summary:
  Process p p > t t~ [QCD]
  Run at p-p collider (6500.0 + 6500.0 GeV)
  Number of events generated: 10000
  Total cross section: 6.808e+02 +- 4.8e+00 pb

---

  Scale variation (computed from LHE events):
      Dynamical_scale_choice -1 (envelope of 9 values):
          6.939e+02 pb +10.5% -12.1%

---

INFO: The /home/shilpa/projects/MG5_aMC_v3_5_4/my_ttbar_nlo/Events/run_02/events.lhe.gz file has been generated.

INFO: Events generated
reweight -from_cards
decay_events -from_cards
INFO: Preparing MCatNLO run
INFO: Using LHAPDF v6.5.4 interface for PDFs
INFO: Compiling MCatNLO for PYTHIA8...
USING PYTHIA 8.3xy
g++ -std=c++11 -O -I/home/shilpa/projects/MG5_aMC_v3_5_4/HEPTools/pythia8/include
-I/home/shilpa/projects/MG5_aMC_v3_5_4/my_ttbar_nlo/MCatNLO/include Pythia83.cc -o Pythia8.exe
-L/home/shilpa/projects/MG5_aMC_v3_5_4/HEPTools/pythia8/lib -lpythia8
Error: cannot find valid configuration for Pythia 8 -L../lib -Lror: -Lnnot -Lnd -Llid -Lnfiguration -Lr -Lthia \

In file included from Pythia83.cc:4:
/home/shilpa/projects/MG5_aMC_v3_5_4/HEPTools/pythia8/include/Pythia8Plugins/HepMC2.h:23:10: fatal error: HepMC/IO_BaseClass.h: No such file or directory
23 | #include "HepMC/IO_BaseClass.h"
| ^~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
make: *** [Makefile:56: Pythia83] Error 1
Pythia8 compilation did not succeed, exiting

Error detected in "launch"
write debug file /home/shilpa/projects/MG5_aMC_v3_5_4/my_ttbar_nlo/run_02_tag_1_debug.log
If you need help with this issue, please, contact us on https://answers.launchpad.net/mg5amcnlo
str : Compilation failed, check /home/shilpa/projects/MG5_aMC_v3_5_4/my_ttbar_nlo/mcatnlo.log for details

Does anyone know what could be happening?
Thanks

[comrademarvin]

" HepMC/IO_BaseClass.h: No such file or directory
23 | #include "HepMC/IO_BaseClass.h" "

I am experiencing the same issues when simply compiling pythia with HepMC2 and including in a main.

Have you perhaps been able to solve it?