Unhandled Exception

When you press "Go", does anyone know why it says "Unhandled Exception: Unhandled Memory Exception Error"?:

Strict 
Local window2:TGadget
Local filemenu:TGadget
Local window:TGadget
Local htmlview:TGadget
Local textfield:TGadget
Local go:TGadget

Const MENU_BACK=101
Const MENU_FORWARD=102
Const MENU_EXIT=103
window=CreateWindow("Surfer",30,20,900,940,,15|WINDOW_ACCEPTFILES)
filemenu=CreateMenu("&File",0,WindowMenu(window))
CreateMenu"&Back",MENU_BACK,filemenu,key_b,MODIFIER_COMMAND
CreateMenu"&Forward",MENU_FORWARD,filemenu,key_f,MODIFIER_COMMAND
CreateMenu"",0,filemenu
CreateMenu"&Exit",MENU_EXIT,filemenu,MODIFIER_COMMAND
htmlview=CreateHTMLView(0,21,ClientWidth(window),ClientHeight(window),window)
SetGadgetLayout htmlview,1,1,1,1 

HtmlViewGo htmlview,"www.knology.net/peabraininc"
'window2=CreateWindow("Address",30,20,300,150,,15|WINDOW_ACCEPTFILES)
textfield=CreateTextField(0,0,300,20,window)
go=CreateButton("Go",301,0,30,20,window,BUTTON_OK)
SetGadgetText textfield,"www.knology.net/peabraininc"
UpdateWindowMenu window
While WaitEvent()
	ShowGadget(go)
	ShowGadget(textfield)
	'Print CurrentEvent.ToString()
	Select EventID()
		Case EVENT_WINDOWCLOSE
			End
		Case EVENT_MENUACTION
			Select EventData()
				Case MENU_BACK
					HtmlViewBack(htmlview)
				Case MENU_FORWARD
					HtmlViewForward(htmlview)
				Case MENU_EXIT
					End
			End Select
		Case EVENT_GADGETACTION
			Select EventSource()
				Case go
					HtmlViewGo(htmlview,TextAreaText(textfield))
			End Select

	End Select
	
Wend

figured it out myself again