Issues with array being delcared as variable

#include <ButtonConstants.au3>
#include <EditConstants.au3>
#include <GUIConstantsEx.au3>
#include <StaticConstants.au3>
#include <WindowsConstants.au3>

$Form1_1 = GUICreate("Test", 615, 438, 215, 170)
$RDCNextProjectButton = GUICtrlCreateButton("Next Project", 183, 241, 99, 33)
GUICtrlSetState(-1, $GUI_DISABLE)
$ProjectNameInputBox = GUICtrlCreateInput("", 35, 104, 193, 21)
$ProjectNameLabel = GUICtrlCreateLabel("Please Input Your Project Name", 27, 80, 200, 17)
GUICtrlSetFont(-1, 8, 800, 0, "MS Sans Serif")
$NumberOfProjectsLabel = GUICtrlCreateLabel("Please Input The Number Of Projects You Have Of This Kind", 19, 160, 364, 17)
GUICtrlSetFont(-1, 8, 800, 0, "MS Sans Serif")
$RDCNumberOfProjectsInput = GUICtrlCreateInput("", 49, 198, 193, 21)
$Submit = GUICtrlCreateButton("Submit", 72, 240, 99, 33)
GUICtrlSetState(-1, $GUI_ENABLE)
$RDCNumberOfProjectsRead = GUICtrlRead ($RDCNumberOfProjectsInput)

$I = $RDCNumberOfProjectsRead;<-------------------------------------------------------This will read the number that you entered into the "number of projects" inputbox.
GUISetState(@SW_SHOW)
#EndRegion ### END Koda GUI section ###
Dim $alphabit[26]
$alphabit[0]="A"
$alphabit[1]="B"
$alphabit[2]="C"
$alphabit[3]="D"
$alphabit[4]="E"
$alphabit[5]="F"
$alphabit[6]="G"
$alphabit[7]="H"
$alphabit[8]="I"
$alphabit[9]="J"
$alphabit[10]="K"
$alphabit[11]="L"
$alphabit[12]="M"
$alphabit[13]="N"
$alphabit[14]="O"
$alphabit[15]="P"
$alphabit[16]="Q"
$alphabit[17]="R"
$alphabit[18]="S"
$alphabit[19]="T"
$alphabit[20]="U"
$alphabit[21]="V"
$alphabit[22]="W"
$alphabit[23]="X"
$alphabit[24]="Y"
$alphabit[25]="Z"

While 1
$nMsg = GUIGetMsg()
Switch $nMsg
Case $GUI_EVENT_CLOSE
Exit

Case $RDCNumberOfProjectsInput
$RDCNumberOfProjectsRead = GUICtrlRead ($RDCNumberOfProjectsInput)
If ($RDCNumberOfProjectsRead) > 1 Then;<------------------------------------------------------If the number of projects entered is more than 1 then it will enable the next ;project button and disable the submit button.
GUICtrlSetState ($RDCNextProjectButton, $GUI_ENABLE)
GUICtrlSetState($Submit, $GUI_DISABLE)
ElseIf ($RDCNumberOfProjectsRead) <= 1 Then;<----------------------------------------------If the number of projects entered is 1 then it will keep the next project button ;disabled
GUICtrlSetState ($RDCNextProjectButton, $GUI_DISABLE)
GUICtrlSetState($Submit, $GUI_ENABLE)
EndIf
$CapacityInput = ($RDCNumberOfProjectsRead * 10)

Case $RDCNextProjectButton


Local $ProjectNameRead = GUICtrlRead ($ProjectNameInputBox)
$RDCNumberOfProjectsRead = GUICtrlRead ($RDCNumberOfProjectsInput)

$sFirst= $alphabit[1]

For $I = $RDCNumberOfProjectsRead To 1 Step - 1

$iASCII = Asc($sFirst)
$iASCII += 1
$sNext = Chr($iASCII)
Local $sinput = $ProjectNameRead
If $sinput = $ProjectNameRead Then
local $soutput =StringRegExpReplace($sinput, "\-01A-" & $alphabit & "Q", "-01"& $sNext &"-Q");<------Read the project name and if exist then rename "01A-" to "01B" which would be the next letter, and it should continue in this fashion based on the number of projects entered..
guictrlsetdata ($ProjectNameInputBox,$soutput)
MsgBox(0,"", "Testing Countdown Loop " & $i)
MsgBox(0,"","The total of capacity is " & $CapacityInput & "GB")
MsgBox(0,"","The next project name should be " & $soutput)

EndIf

Next
GUICtrlSetState ($RDCNextProjectButton, $GUI_DISABLE)
GUICtrlSetState($Submit, $GUI_ENABLE)
Case $Submit
MsgBox(0,"","End of Script","")
Exit

EndSwitch
WEnd