mg5amc_py8_interface

Hello,

after the appearance of this message

    A Pythia8 path is specified via the option 'pythia8_path' but no path for option
    'mg5amc_py8_interface_path' is specified. This means that Pythia8 cannot be used
    leading order simulations with MadEvent.
    Consider installing the MG5_aMC-PY8 interface with the following command:
     MG5_aMC>install mg5amc_py8_interface

I am trying to download mg5amc_py8_interface but this error message appears

MG5_aMC>install mg5amc_py8_interface
   You are installing 'mg5amc_py8_interface', please cite ref(s): arXiv:1410.3012, arXiv:XXXX.YYYYY.
Downloading the HEPToolInstaller at:
   http://madgraph.phys.ucl.ac.be/Downloads/HEPToolsInstaller/HEPToolsInstaller_V106.tar.gz
Now installing mg5amc_py8_interface. Be patient...
Fetching data with command:
  wget --no-check-certificate http://madgraph.phys.ucl.ac.be/Downloads/MG5aMC_PY8_interface/MG5aMC_PY8_interface_V1.0.tar.gz
--2018-11-08 09:49:08-- http://madgraph.phys.ucl.ac.be/Downloads/MG5aMC_PY8_interface/MG5aMC_PY8_interface_V1.0.tar.gz
Resolving madgraph.phys.ucl.ac.be (madgraph.phys.ucl.ac.be)... 130.104.133.249
Connecting to madgraph.phys.ucl.ac.be (madgraph.phys.ucl.ac.be)|130.104.133.249|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 19675 (19K) [application/x-gzip]
Saving to: ‘MG5aMC_PY8_interface_V1.0.tar.gz’

MG5aMC_PY8_interface_V1.0.tar.gz 100%[=====================================================================================>] 19.21K --.-KB/s in 0.05s

2018-11-08 09:49:08 (417 KB/s) - ‘MG5aMC_PY8_interface_V1.0.tar.gz’ saved [19675/19675]

Installing tool 'mg5amc_py8_interface'...
    > Follow the installation progress by running the command below in a separate terminal)
    > tail -f /home/christina/Programs/MG5_aMC_v2_6_3_2/HEPTools/MG5aMC_PY8_interface/mg5amc_py8_interface_install.log
A problem occured during the installation of 'mg5amc_py8_interface'.
Content of the installation log file '/home/christina/Programs/MG5_aMC_v2_6_3_2/HEPTools/MG5aMC_PY8_interface/mg5amc_py8_interface_install.log':

Error in MG5aMC_PY8_interface installer. Could not find file:
   /home/christina/Programs/pythia8235/share/Pythia8/examples/Makefile.inc

Command "install mg5amc_py8_interface" interrupted with error:
InvalidCmd : Installation of mg5amc_py8_interface failed.

What's the problem exactly? Thanks a lot!

Cheers,
Christina