Error in simulation

[rabebbenothmen]

Hi, I try to run the code but I get this error:

/workspace/ns-allinone-3.25/ns-3.25$ ./waf --run scratch/blockchain-simulator

Waf: Leaving directory `/home/rabeb/workspace/ns-allinone-3.25/ns-3.25/build'
Build failed
-> task in 'ns3-applications' failed (exit status 1):
{task 140411083174544: cxx network-helper.cc -> network-helper.cc.1.o}
['/usr/bin/g++', '-std=c++11', '-Wno-unused-parameter', '-fPIC', '-pthread', '-I.', '-I..', '-DNS3_BUILD_PROFILE_DEBUG', '-DNS3_ASSERT_ENABLE', '-DNS3_LOG_ENABLE', '-DHAVE_SYS_IOCTL_H=1', '-DHAVE_IF_NETS_H=1', '-DHAVE_NET_ETHERNET_H=1', '-DHAVE_PACKET_H=1', '-DHAVE_IF_TUN_H=1', '../src/applications/helper/network-helper.cc', '-c', '-o', '/home/rabeb/workspace/ns-allinone-3.25/ns-3.25/build/src/applications/helper/network-helper.cc.1.o']

Could you help me, please?
Thank you