Program received signal SIGSEGV, Segmentation fault.
0x00007ffff1020849 in ns3::AttributeIterator::StartVisitArrayItem (
    this=0x7fffffffd110, vector=..., index=0, item=...)
    at ../src/config-store/model/attribute-iterator.cc:180
180	  m_currentPath.push_back ("$" + item->GetInstanceTypeId ().GetName ());
(gdb) back
#0  0x00007ffff1020849 in ns3::AttributeIterator::StartVisitArrayItem (
    this=0x7fffffffd110, vector=..., index=0, item=...)
    at ../src/config-store/model/attribute-iterator.cc:180
#1  0x00007ffff10215c6 in ns3::AttributeIterator::DoIterate (
    this=0x7fffffffd110, object=...)
    at ../src/config-store/model/attribute-iterator.cc:238
#2  0x00007ffff1021bd3 in ns3::AttributeIterator::DoIterate (
    this=0x7fffffffd110, object=...)
    at ../src/config-store/model/attribute-iterator.cc:276
#3  0x00007ffff1021624 in ns3::AttributeIterator::DoIterate (
    this=0x7fffffffd110, object=...)
    at ../src/config-store/model/attribute-iterator.cc:240
#4  0x00007ffff101fd78 in ns3::AttributeIterator::Iterate (this=0x7fffffffd110)
    at ../src/config-store/model/attribute-iterator.cc:47
#5  0x00007ffff102b4a1 in ns3::ModelCreator::Build (this=0x7fffffffd110, 
    treestore=0x807800) at ../src/config-store/model/model-node-creator.cc:34
#6  0x00007ffff102ac83 in ns3::GtkConfigStore::ConfigureAttributes (
    this=0x7fffffffdf0f) at ../src/config-store/model/gtk-config-store.cc:104
#7  0x000000000040f317 in main (argc=2, argv=0x7fffffffe068)
    at ../scratch/lena-simple-epc.cc:188
(gdb)