How do I fix the error C2011 in C++? DESC: 'Entity': 'class' type redefinition [duplicate]

I'm new to C++ and I would appreciate some help for my project.

I am currently developing a "Mod" for a video game with C++, and I keep getting the error

C2011: 'Entity': 'class' type redefinition

Here is my Entity.cpp file:

#include "include.h"

DWORD Entity::Get(int Index)
{
    return *(DWORD*)(Global_GameModule + dwEntityList + (Index * 0x10));
}
int Entity::GetHealth(DWORD Entity)
{
    return *(int*)(Entity + m_iHealth);
}
int Entity::GetTeam(DWORD Entity)
{
    return *(int*)(Entity + m_iTeamNum);
}

Entity.h file:

#include "include.h"

class Entity
{
public:
    DWORD Get(int Index);

    int GetHealth(DWORD Entity);
    int GetTeam(DWORD Entity);
};

If you need more information/more code (e. g. my include.h file) feel free to tell me that!