problem with interface Class - Error:undefined interface

[k.qasempour]

im trying to test a plugin based application... so as u know i have an interface and then a plug-in which manipulate the interface... i think everything is OK but i face with this error>>
( error: Undefined interface)
. here is my code... how knows wahts the problem

//// pro file 
#-------------------------------------------------
#
# Project created by QtCreator 2012-08-11T13:34:07
#
#-------------------------------------------------
 
QT       += core
 
QT       -= gui
 
TARGET = CAlPlugin_Based
CONFIG   += console
CONFIG   -= app_bundle
 
 
 
TEMPLATE = app
 
 
SOURCES +=  main.cpp
 
HEADERS += \
    EvaluateInterface.h\
    Evaluate.h

//// pro file 
#-------------------------------------------------
#
# Project created by QtCreator 2012-08-11T13:34:07
#
#-------------------------------------------------

QT       += core

QT       -= gui

TARGET = CAlPlugin_Based
CONFIG   += console
CONFIG   -= app_bundle



TEMPLATE = app


SOURCES +=  main.cpp

HEADERS += \
    EvaluateInterface.h\
    Evaluate.h

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//// Evaluate.h file
#ifndef EVALUATE_H
#define EVALUATE_H
 
#include<EvaluateInterface.h>
 
class evaluate : public evaluateInterface
{
    Q_OBJECT
    Q_INTERFACES(evaluateInterface)
 
public:
QString name1() const;
 int evaluate1(int num1, int num2) const;
};
 
#endif // EVALUATE_H

//// Evaluate.h file
#ifndef EVALUATE_H
#define EVALUATE_H

#include<EvaluateInterface.h>

class evaluate : public evaluateInterface
{
    Q_OBJECT
    Q_INTERFACES(evaluateInterface)

public:
QString name1() const;
 int evaluate1(int num1, int num2) const;
};

#endif // EVALUATE_H

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/

/// EvaluateInterface.h 
 
#ifndef EVALUATEINTERFACE_H
#define EVALUATEINTERFACE_H
 
 
 
class evaluateInterface
{
public:
    virtual ~evaluateInterface(){}
 
    virtual QString name1() const=0;
    virtual int evaluate1(int num1,int num2) const=0;
};
Q_DECLARE_INTERFACE(evaluateInterface,"CaaaalInterface/1.0")
 
#endif // EVALUATEINTERFACE_H

/// EvaluateInterface.h 

#ifndef EVALUATEINTERFACE_H
#define EVALUATEINTERFACE_H



class evaluateInterface
{
public:
    virtual ~evaluateInterface(){}

    virtual QString name1() const=0;
    virtual int evaluate1(int num1,int num2) const=0;
};
Q_DECLARE_INTERFACE(evaluateInterface,"CaaaalInterface/1.0")

#endif // EVALUATEINTERFACE_H

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Whats the problem then... thank u alll

[high_flyer]

Have class evaluate subclass QObject as well.