You need to first [https://cp3.irmp.ucl.ac.be/projects/delphes/wiki/WorkBook/Pythia8 install Pythia8 and link it to Delphes] , since the code uses Pythia8 particle gun feature. 

To run the the Delphes validation code:
{{{
./examples/validation.sh [detector_card] [number_of_events]
}}}