declaring subclasses in C++

[Paat]

hello, i'm trying to create subclasses to a class, but i get the same error to all my subclasses: expected class-name before*'{' token. Ive checked on other threads and site since it seems that this problem is very common. here is my code:

MoyenDeTransport.h:

class MoyenDeTransport
{
        double litre;
    public:
        MoyenDeTransport(double);
        double getLitre();
        //void parcourir(int distance);
 
};

class MoyenDeTransport
{
        double litre;
    public:
        MoyenDeTransport(double);
        double getLitre();
        //void parcourir(int distance);

};

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and here is my subclass:
Camion

class Camion: public MoyenDeTransport
{
public:
    Camion();
};

class Camion: public MoyenDeTransport
{
public:
    Camion();
};

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as a matter of fact, i get one warning and one error:

warning: In File included from camion.cpp:1,
error: expected class-name before*'{' token

here is my camion.cpp:

#include "camion.h"
 
Camion::Camion()
{
}

#include "camion.h"

Camion::Camion()
{
}

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and just in case, here is my MoyenDeTransport.cpp:

#include "moyendetransport.h"
 
MoyenDeTransport::MoyenDeTransport(double ammount)
{
    litre = ammount;
}

#include "moyendetransport.h"

MoyenDeTransport::MoyenDeTransport(double ammount)
{
    litre = ammount;
}

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I dont think i'm doing anything flagrantly wrong, but i'm sure its one small thing that i'm missing...

What do you guys think?

Paat