In Visual Studio, how do I fix this exception being thrown?

I just got help with the first exception, but now I have more. Also, would it be helpful to put breakpoints anywhere?

Here is my code so far..

App.h

#pragma once

#include $"$UI$.$h$"$

#include

class App : public wxApp

$\{$

public:

virtual bool OnInit$()$ override;

$\}$;

UI$.$h

#pragma once

#include $"$wx$/$event$.$h$"$

#include $"$wx$/$sizer$.$h$"$

#include

#include

#include

#include

class uiFrame : public wxFrame

$\{$

public:

uiFrame$($const wxString& title, const wxPoint& pos, const wxSize& size$)$;

private:

wxTextCtrl$*$ textBox;

void buttonClick$($wxCommandEvent& event$)$;

wxDECLARE$\_$EVENT$\_$TABLE$()$;

$\}$;

App.cpp

#include "App.h$"$

#include $"$UI$.$h$"$

#include

bool App::OnInit$()$

$\{$

uiFrame$*$ frame $=$ new uiFrame $("$Calculator$",$ wxDefaultPosition, wxSize$(300,400))$;

frame$->$Show$($true$)$;

return true;

$\}$

UI$.$cpp

#include $"$UI$.$h$"$

#include

#include "App.h$"$

#include

#include

#include

wxBEGIN$\_$EVENT$\_$TABLE$($uiFrame$,$ wxFrame$)$

EVT$\_$BUTTON$($wxID$\_$ANY, uiFrame::buttonClick$)$

wxEND$\_$EVENT$\_$TABLE$()$

uiFrame::uiFrame$($const wxString& title, const wxPoint& pos, const wxSize& size$)$ : wxFrame$($NULL$,$ wxID$\_$ANY, title, pos, size$)$

$\{$

wxBoxSizer$*$ calcSizer $=$ new wxBoxSizer$($wxVERTICAL$)$;

textBox $=$ new wxTextCtrl$($this$,$ wxID$\_$ANY, $"",$ wxDefaultPosition, wxDefaultSize, wxTE$\_$PROCESS$\_$ENTER$)$;

calcSizer$->$Add$($textBox$,0,$ wxEXPAND $|$ wxALL, $5)$;

wxGridSizer$*$ buttonGrid $=$ new wxGridSizer$(5,5,5,5)$;

for $($int i $=0$; i ; i$++)$

$\{$

wxString label $=$ wxString::Format$("\%$d$",$ i$)$;

wxButton$*$ numButton $=$ new wxButton$($this$,$ wxID$\_$ANY, label$)$;

buttonGrid$->$Add$($numButton$,0,$ wxEXPAND$)$;

numButton$->$Connect$($wxID$\_$ANY, wxEVT$\_$BUTTON, wxCommandEventHandler$($uiFrame::buttonClick$),$ this$)$;

$\}$

wxArrayString operators;

operators.Add$("+")$;

operators.Add$("-")$;

operators.Add$("*")$;

operators.Add$("/")$;

operators.Add$("\%")$;

operators.Add$("$sin$")$;

operators.Add$("$cos$")$;

operators.Add$("$tan$")$;

operators.Add$("=")$;

operators.Add;

operators.Add$("$Clear$")$;

operators.Add$(".")$;

operators.Add$("$Neg$")$;

for $($const wxString& oper : operators$)$

$\{$

wxButton$*$ operButton $=$ new wxButton$($this$,$ wxID$\_$ANY, oper$)$;

buttonGrid$->$Add$($operButton$,0,$ wxEXPAND$)$;

operButton$->$Connect$($wxID$\_$ANY, wxEVT$\_$BUTTON, wxCommandEventHandler$($uiFrame::buttonClick$),$ this$)$;

$\}$

calcSizer$->$Add$($buttonGrid$,1,$ wxEXPAND $|$ wxALL, $5)$;

SetSizer$($calcSizer$)$;

$\}$

void uiFrame::buttonClick$($wxCommandEvent & event$)$

$\{$

wxButton$*$ button $=$ wxDynamicCast$($event$.$GetEventObject$(),$ wxButton$)$;

if $(!$button$)$ return;

$\{$

wxString label $=$ button$->$GetLabel$()$;

wxString currentText;

if $($textBox$)$

$\{$

currentText $=$ textBox$->$GetValue$()$;

$\}$

else

$\{$

currentText $=$ "Error: textBox is null";

$\}$

if $($label$.$IsNumber$())$

$\{$

currentText $+=$ label;

$\}$

else if $($label $=="+"||$ label $=="-"||$ label $=="*"||$ label $=="/"||$ label $=="\%"||$ label $==$ "sin" $||$ label $==$ "cos" $||$ label $==$ "tan"$)$

$\{$

currentText $+=""+$ label $+""$;

$\}$

else if $($label $=="=")$

$\{$

wxStringTokenizer tokenizer$($currentText$,"")$;

double result $=0$;

wxString lastOp;

while $($tokenizer$.$HasMoreTokens$())$

$\{$

wxString token $=$ tokenizer.GetNextToken$()$;

if $($token$.$IsNumber$())$

$\{$

double number;

token.ToDouble$($&number$)$;

if $($lastOp $=="+")$

$\{$

result $+=$ number;

$\}$

else if $($lastOp $=="-")$

$\{$

result $-=$ number;

$\}$

else if $($lastOp $=="/")$

$\{$

result $/=$ number;

$\}$

else if $($lastOp $=="*")$

$\{$

result $*=$ number;

$\}$

else if $($lastOp $=="$&$")$

$\{$

result $=$ fmod$($result$,$ number$)$;

$\}$

else if $($lastOp $==$ "sin"$)$

$\{$

result $=$ sin$($number$)$;

$\}$

else if $($lastOp $==$ "cos"$)$

$\{$

result $=$ cos$($number$)$;

$\}$

else if $($lastOp $==$ "tan"$)$

$\{$

result $=$ tan$($number$)$;

$\}$

$\}$

else

$\{$

lastOp $=$ token;

$\}$

$\}$

currentText $=$ wxString::Format$("\%\mathrm{.}2$f$",$ result$)$;

$\}$

else if $($label $==$ "Clear"$)$

$\{$

currentText $=""$;

$\}$

else if $($label

$\{$

if $(!$currentText.IsEmpty$())$

$\{$

currentText.RemoveLast$()$;

$\}$

$\}$

else if $($label $==".")$

$\{$

currentText $+="."$;

$\}$

else if $($label $==$ "Neg"$)$

$\{$

if $($currentText$.$StartsWith$("-"))$

$\{$

currentText $=$ currentText.Mid$(1)$;

$\}$

else

$\{$

currentText $="-"+$ currentText;

$\}$

$\}$

textBox$->$SetValue$($currentText$)$;

$\}$

$\}$

wxIMPLEMENT$\_$APP$($App$)$;