Problem mit GUICtrlRead

#include <ButtonConstants.au3>
#include <EditConstants.au3>
#include <GUIConstantsEx.au3>
#include <WindowsConstants.au3>
#Region ### START Koda GUI section ### Form=c:\users\hans\desktop\autoit test\lanchecker\w gui\lan checker v01a gui.kxf
$Form1 = GUICreate("IP Checker v0.1c", 312, 263, 669, 389)
GUICtrlSetLimit(-1, 16)
$Button1 = GUICtrlCreateButton("Check!", 228, 24, 61, 25, $WS_GROUP)
$Group1 = GUICtrlCreateGroup("IP-Check", 16, 8, 277, 49)
GUICtrlCreateGroup("", -99, -99, 1, 1)
$IP_Input = GUICtrlCreateInput("Enter IP or Hostname", 20, 20, 205, 25, BitOR($ES_CENTER,$ES_AUTOHSCROLL))
$Label1 = GUICtrlCreateLabel("...", 236, 240, 71, 13)
$IPAddress2 = GUICtrlCreateInput("Enter IP or Hostname", 20, 80, 205, 25, BitOR($ES_CENTER,$ES_AUTOHSCROLL))
$Group2 = GUICtrlCreateGroup("Durchsuchen...", 16, 64, 277, 53)
$Button2 = GUICtrlCreateButton("Search!", 232, 80, 53, 25, $WS_GROUP)
GUICtrlCreateGroup("", -99, -99, 1, 1)
GUISetState(@SW_SHOW)
#EndRegion ### END Koda GUI section ###
While 1
	$nMsg = GUIGetMsg()
	Switch $nMsg
		Case $GUI_EVENT_CLOSE
			Exit
		Case $Button1
			$IP_Input = GUICtrlRead($IP_Input)
			Run ("cmd")
			WinWaitActive ("Administrator")
			$p = send ("ping " & $IP_Input)
			Send ("{enter}")

	EndSwitch
Wend

While 1
	$nMsg = GUIGetMsg()
	Switch $nMsg
		Case $GUI_EVENT_CLOSE
			Exit
		Case $Button2
			$IPAddress2 = GUICtrlRead($IPAddress2)
			Run ("cmd")
			WinWaitActive ("Administrator")
			$p = send ("ping " & $IPAddress2)
			Send ("{enter}")
	EndSwitch
Wend