Hi All, Would you please inform me how to correct this error? Thank you very much for your help in advance. Best Regards, Sebnem [root@diguerr5 geant4.9.0.p01]# source env.sh On this machine the G4SYSTEM=Linux-g++ On this machine the G4INSTALL=/usr/local/gate/gate_v3.1.2/geant4.9.0.p01 On this machine the G4INCLUDE=/usr/local/gate/gate_v3.1.2/geant4.9.0.p01/include/ On this machine the G4LIB=/usr/local/gate/gate_v3.1.2/geant4.9.0.p01/lib On this machine the G4LEVELGAMMADATA=/usr/local/gate/gate_v3.1.2/geant4.9.0.p01/data/PhotonEvaporation2.0 On this machine the G4RADIOACTIVEDATA=/usr/local/gate/gate_v3.1.2/geant4.9.0.p01/data/RadioactiveDecay3.2 On this machine the G4LEDATA=/usr/local/gate/gate_v3.1.2/geant4.9.0.p01/data/G4EMLOW4.3 On this machine the G4NEUTRONHPDATA=/usr/local/gate/gate_v3.1.2/geant4.9.0.p01/data/G4NDL3.11 On this machine the CLHEP_BASE_DIR=/usr/local/gate/gate_v3.1.2/CLHEP-<a href="http://2.0.3.1">2.0.3.1</a> On this machine the CLHEP_INCLUDE_DIR=/usr/local/gate/gate_v3.1.2/CLHEP-<a href="http://2.0.3.1/include">2.0.3.1/include</a> On this machine the CLHEP_LIB_DIR=/usr/local/gate/gate_v3.1.2/CLHEP-<a href="http://2.0.3.1/lib">2.0.3.1/lib</a> On this machine the CLHEP_LIB=CLHEP On this machine the G4VIS_BUILD_OPENGLX_DRIVER=1 On this machine the G4VIS_USE_OPENGLX=1 On this machine the XMFLAGS= -I/include On this machine the XMLIBS= -L/lib -lXm -lXpm On this machine the XMFLAGS= -I/include On this machine the XAWFLAGS= On this machine the XAWLIBS= On this machine the G4LIB_BUILD_SHARED=1 On this machine the G4LIB_BUILD_STATIC=1 On this machine the G4UI_USE_TCSH=1 LD_LIBRARY_PATH is set to include CLHEP and Geant4 libraries. NOTE : verify that the correct path for the CLHEP library - $CLHEP_BASE_DIR/lib - is included in the $LD_LIBRARY_PATH variable in your environment, and no other outdated installations of CLHEP are by chance referenced through $LD_LIBRARY_PATH and present in your system ! <div class="gmail_quote"> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> </blockquote></div>