Окно ошибки

//----Прямоугольник-----------------------------------------------------------------------
 
#include <vcl.h>
#include <math.h>
#pragma hdrstop
 
#include "Unit2.h"
#include "Unit1.h"
#include "Unit5.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TPryam *Pryam;
 float a,b;
 int m=100;
float f(float x){
 return (1/(sqrt(2*pow(x,2)+3)));
  }
//---------------------------------------------------------------------------
__fastcall TPryam::TPryam(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------
 
void __fastcall TPryam::aaChange(TObject *Sender)
{
aa->Text;
}
//---------------------------------------------------------------------------
 
void __fastcall TPryam::beChange(TObject *Sender)
{
be->Text;
}
//---------------------------------------------------------------------------
 
void __fastcall TPryam::Panel1Click(TObject *Sender)
{
if(aa->Text >='0' && aa->Text <='9' && be->Text >='0' && be->Text <='9'){
a=StrToFloat(aa->Text);
b=StrToFloat(be->Text);
float s=0;
float x;
float h=(b-a)/m;
x=a;
while(x<=b){
s+=f(x+h/2);
x+=h;}
float f;
f=s*h;
Otvet->Text=f;}
else
Errore->Show();
}
//---------------------------------------------------------------------------