AI Finite state error error C2143:

#ifndef _ENTITY_H_#define _ENTITY_H_#pragma once#include "allegro.h"#include "Sprite.h"class State;class entity{public:	entity(void);	~entity(void);	State* m_pCurrentState;	State* m_pPreviousState;	Sprite m_sprite;	void Update();	void ChangeState( State* p_newState );};#endif #include "entity.h"#include "state.h"entity::entity(void){	m_pCurrentState = NULL;	m_pPreviousState = NULL;}entity::~entity(void){}void entity::Update(){	m_pCurrentState->execute(this);}void entity::ChangeState( State* p_newState) {	if( m_pCurrentState != NULL )	{			//Save the previous state		m_pPreviousState = m_pCurrentState;		//Delete the current state		delete m_pCurrentState;	}//end if	else{		m_pPreviousState = p_newState;	}	//change the state	m_pCurrentState = p_newState;}</code> here is the states<code>#include "entity.h"#ifndef _STATE_H_#define _STATE_H_#pragma onceclass entity;class State_Right;class State_Left;class State_Down;class State_UP;//The state abstract classclass State{public:	int prev;	virtual void execute( entity* p_e )=0;};//State right change the direction of the entity to go rightclass State_Right : public State{private:	public:	State_Right();	void execute( entity* p_e );};//State go left////////////////////////////////////////class State_Left : public State{private:	public:	State_Left();	void execute( entity* p_e );};//State go down///////////////////////////////////////class State_Down_Left : public State{private:	public:	State_Down_Left();	void execute( entity* p_e );};//State go down///////////////////////////////////////class State_Down_Right : public State{private:	public:	State_Down_Right();	void execute( entity* p_e );};//State go up////////////////////////////////////////class State_Up : public State{private:	public:	State_Up();	void execute( entity* p_e );};#include "State.h"void State::execute( entity *p_e ){}////////////////////State Right//////////////State_Right::State_Right(){	prev =0;}void State_Right::execute(entity *p_e){	static int delay = 10;	static int timer =0;	static int space = 0;	if( timer >= delay )	{		timer = 0;		space = p_e->m_sprite.getSpriteStats()->width;	}//end if	else{		++timer;		space=0;	}//end else	//Move the sprite	p_e->m_sprite.setPos(p_e->m_sprite.getXpos()+space, p_e->m_sprite.getYpos());	if( p_e->m_sprite.getXpos()+p_e->m_sprite.getSpriteStats()->width >= SCREEN_W )	{		p_e->ChangeState( new State_Down_Left());	}}//State_Down//////////////////////////////State_Down_Left::State_Down_Left(){	prev =3;}void State_Down_Left::execute(entity *p_e){	//Move the sprite down on then switch to the left	p_e->m_sprite.setPos(p_e->m_sprite.getXpos(), p_e->m_sprite.getYpos()+p_e->m_sprite.getSpriteStats()->height);	p_e->ChangeState(new State_Left());	if( p_e->m_sprite.getYpos() >= SCREEN_H )	{		p_e->m_sprite.setPos(0,0);	}}//////////////////////////////////////////State_Down_Right::State_Down_Right(){	prev =3;}void State_Down_Right::execute(entity *p_e){	//Move the sprite down on then switch to the left	p_e->m_sprite.setPos(p_e->m_sprite.getXpos(), p_e->m_sprite.getYpos()+p_e->m_sprite.getSpriteStats()->height);	p_e->ChangeState(new State_Right());	if( p_e->m_sprite.getYpos() >= SCREEN_H )	{		p_e->m_sprite.setPos(0,0);	}}//State_Left////////////////////////////State_Left::State_Left(){	prev =1;}void State_Left::execute(entity *p_e){	static int delay = 10;	static int timer =0;	static int space = 0;	if( timer >= delay )	{		timer = 0;		space = p_e->m_sprite.getSpriteStats()->width;	}//end if	else{		++timer;		space=0;	}//end else	//Move the sprite	p_e->m_sprite.setPos(p_e->m_sprite.getXpos()-space, p_e->m_sprite.getYpos());	if( p_e->m_sprite.getXpos() <= 0 )	{		p_e->ChangeState( new State_Down_Right());	}}//State_Up////////////////////////////////State_Up::State_Up(){}#endif </code>Here is the main<code> #include "allegro.h"#include "entity.h"entity e;e.ChangeState(new State_Right);//main functionvoid main(void){    //main loop    return;}END_OF_MAIN()Thanks in advance for your help[IFox: Added source tags]