Parameterization Problems

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Hello, I am trying to create a cerenkov detector. The detector is a quartz sphere with 121 quartz channels extending from one side of the sphere. I am trying to make the channels using parameterized tubs extending from one hemisphere of the quartz sphere. Then I would like to put MultiFunctionalDetectors at the bottom of each channel.

My problem is when trying to compile and link my code I get

Compiling Ex06ChannelParameterisation.cc ...

src/Ex06ChannelParameterisation.cc:45: error: declaration of 'EXN06ChannelParameterisation::EXN06ChannelParameterisation(G4int, G4double, G4double, G4double)' outside of class is not definition

I am not sure what this is referring to because my .hh file is defined as

class EXN06ChannelParameterisation : public G4VPVParameterisation
{ 
  public:

    EXN06ChannelParameterisation(G4int    NoChambers, 
                                 G4double zPlace, 
                                 G4double start,
                                 G4double spacing);

    virtual				 
   ~EXN06ChannelParameterisation();

    void ComputeTransformation (const G4int copyNo,
                                G4VPhysicalVolume* ChannelPhys) const;

And my parameterization source file defines the object as

	EXN06ChannelParameterisation::EXN06ChannelParameterisation(  
                  G4int    NoChambers, 
                  G4double zPLace,
	   	  G4double start, 
	          G4double spacing);

Any light on this error would be much appreciated.

Thanks for your time.