Thank you very much for d help! I think I understood what you r saying. I have made the following changes and it's not giving error.
obj.source = 'lena-x2-handover.cc'
obj = bld.create_ns3_program('lena-x2-handover-measures',
['lte', 'netanim','flow-monitor'])
On Thursday, February 25, 2016 at 4:44:20 PM UTC, Konstantinos wrote: