I had an a figure in geant4, but I am still a novice, I seek your expertise to help me solve my problem
Thank you Best regards
Look at your .cc file again. C++ is a case-sensitive language.
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I checked the .cc but no change
the version of geant4 is 4.11.1
THANKS
Take a close and careful look at line 11 of DetectorConstruction.cc. You will see your mistake, immediately after the second colon.
please can you frame me the place?
this post here is a good read:
okay, please help me
#include "DetectorConstruction.hh"
#include "G4RunManager.hh"
#include "G4NistManager.hh"
#include "G4LogicalVolume.hh"
#include "G4PVPlacement.hh"
#include "G4SystemOfUnits.hh"
#include "globals.hh"
#include "G4Box.hh"
#include "G4VPhysicalVolume.hh"
DetectorConstruction::DetectorConstruction()
{}
DetectorConstruction::~DetectorConstruction()
{}
G4VPhysicalVolume* DetectorConstruction::constrcut()
{
G4NistManager* ext = G4NistManager::Instance();
G4Material* elm = ext->FindOrBuildElement("G4_Fe");
G4Box* EQF=new G4Box("coke",235.*mm,140.*mm,0.*mm);
G4LogicalVolume* logicEQF=new G4LogicalVolume(EQF,elm,"logicEQF");
G4VPhysicalVolume* physEQF=new G4PVPlacement(nullptr,G4ThreeVector(0.,0.,0.),logicEQF,"physEQF",nullptr,false,0,true);
return physEQF;
}
this is the content of “DetectorConstruction.cc” from your opening post. ( Line “11” is actually line 15 now, @mkelsey 
)
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Look at the string after the “::” (that character is called “colon” in American English). That is not the word Construct, which is what it is supposed to be. Nowhere in your DetectorConstruction.cc file do you actually define a function with the name Construct. That’s what the error message is telling you.
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okay, thanks you so much
Please excuse me again for disturbing you, as I am new, I have a problem with the references.
EXPLE.cc (1.6 KB)
PrimaryGeneratorAction.hh (955 Bytes)
ActionInitialization.cc (361 Bytes)
PrimaryGeneratorAction.cc (956 Bytes)
ActionInitialization.hh (413 Bytes)