Hi every one , when i execute this code i get this message "Error in 'essai/S-Function' while executing C MEX S-function 'MLI', (mdlOutputs), at time 0.0 FatalException

#define S_FUNCTION_LEVEL 2

#define S_FUNCTION_NAME MLI

#include "simstruc.h"

#include <math.h>

#define NumContStates 0 /* number of continuous states */

#define NumDiscStates 0 /* number of discrete states */

#define NumInputs 3 /* number of inputs */

#define InputPortWidth1 1 /* width of the input port*/

#define InputPortWidth2 1 /* width of the input port*/

#define InputPortWidth3 1 /* width of the input port*/

#define NumOutputs 2 /* number of outputs */

#define OutputPortWidth1 1 /* number of outputs */

#define OutputPortWidth2 1 /* number of outputs */

#define DirectFeedThrough1 0 /* direct feedthrough flag */

#define DirectFeedThrough2 0 /* direct feedthrough flag */

#define DirectFeedThrough3 0 /* direct feedthrough flag */

#define NumSampleTimes 1 /* number of sample times */

#define NumParams 1 /* number of input arguments */

#define NumRWork 0 /* number of real work vector elements */

#define NumIWork 0 /* number of integer work vector elements */

#define NumPWork 0 /* number of pointer work vector elements */

#define Ts mxGetPr(ssGetSFcnParam(S,0))[0]

static void mdlInitializeSizes(SimStruct *S)

{

ssSetNumContStates(S, NumContStates);

ssSetNumDiscStates(S, NumDiscStates);

if (!ssSetNumInputPorts(S, NumInputs)) return;

ssSetInputPortWidth(S, 0, InputPortWidth1);

ssSetInputPortWidth(S, 1, InputPortWidth2);

ssSetInputPortWidth(S, 2, InputPortWidth3);

if (!ssSetNumOutputPorts(S, NumOutputs)) return;

ssSetOutputPortWidth(S, 0, OutputPortWidth1);

ssSetOutputPortWidth(S, 1, OutputPortWidth2);

ssSetInputPortDirectFeedThrough(S, 0, DirectFeedThrough1);

ssSetInputPortDirectFeedThrough(S, 1, DirectFeedThrough2);

ssSetInputPortDirectFeedThrough(S, 2, DirectFeedThrough3);

ssSetNumSampleTimes(S, NumSampleTimes);

ssSetNumSFcnParams(S, NumParams);

if (ssGetNumSFcnParams(S) != ssGetSFcnParamsCount(S)) {

return;

}

ssSetNumRWork(S, NumRWork);

ssSetNumIWork(S, NumIWork);

ssSetNumPWork(S, NumPWork);

}

static void mdlInitializeSampleTimes(SimStruct *S)

{

ssSetSampleTime(S, 0, Ts);

ssSetOffsetTime(S, 0, 0.0);

}

static void mdlInitializeConditions(double *x0, SimStruct *S){}

static void mdlOutputs(SimStruct *S, int_T tid)

{

real_T *y1 = ssGetOutputPortRealSignal(S, 0);

real_T *y2 = ssGetOutputPortRealSignal(S, 1);

InputRealPtrsType ref = ssGetInputPortRealSignalPtrs(S,0);

InputRealPtrsType car1 = ssGetInputPortRealSignalPtrs(S,1);

InputRealPtrsType car2 = ssGetInputPortRealSignalPtrs(S,2);

double S1,S2;

if ( *ref[0] >= *car1[0] )

{

S1 = 1;

S2 = 1;

}

else if ((*ref[0] < *car1[0]) && (*ref[0] > *car2[0]))

{

S1 = 1;

S2 = 0;

}

else

{

S1 = 0;

S2 = 0;

}

// Outputs:

y1[0] = S1;

y2[0] = S2;

}

#define MDL_UPDATE

static void mdlUpdate(SimStruct *S, int_T tid){}

#define MDL_DERIVATIVES

static void mdlDerivatives(SimStruct *S){}

static void mdlTerminate(SimStruct *S){}

#ifdef MATLAB_MEX_FILE

#include "simulink.c"

#else

#include "cg_sfun.h"

#endif