Subscript Dimension Error When Dynamically Creating Buttons in AutoIt - button

Question

I'm writing an AutoIt script to make GUI buttons by looping through an array of button definitions.
It's a script that I'll be adding/removing buttons to/from quite often, so I thought a loop makes sense. I add the button handle, button text, and function name to bind the button to an array called $buttons. The button parameters are saved to a row of the $buttons array as a pipe delimited string.
Func make_buttons()
local $i = 1
Local $bHandles[Ubound($buttons)]
_arraydisplay($bHandles)
For $button In $buttons
local $params= StringSplit($button,"|")
local $top = $i*40
local $left = 10
local $width = 100
Global $bHandles[$i] = GUICtrlCreateButton($params[1],$left,$top,$width)
GUICtrlSetOnEvent($bHandles[$i],$params[2])
$i = $i+1
Next
EndFunc
I'm getting this error on execution:
Global $params[1] = ^ERROR
Error: Missing subscript dimensions in "Dim" statement
Any help clarifying what the error means is appreciated.
Update
#Sachadee's answer below clued me along to the fact athat I had been using the Global keyword to declare the handle variable to GuiCtrlCreateButton() while trying to use a variable as the name. Leaving off the Global keyword helped me eliminate the error I was receiving. My final button creation lines of code worked as this:
Func make_buttons()
local $i = 1
For $button In $buttons
local $params= StringSplit($button,"|")
local $top = $i*40
local $left = 10
local $width = 100
Global $handle = $params[2] & "_handle"
$handle = GUICtrlCreateButton($params[1],$left,$top,$width)
GUICtrlSetOnEvent($handle,$params[2])
$i = $i+1
Next
EndFunc

Answer 1

Edit :
You're defining an array structure Local $bHandles[Ubound($buttons)] with the place for [N] elements. But you're not defining the content of this array. And then you're trying to redefine it with another value with the Global:
Global $bHandles[$i] = GUICtrlCreateButton($params[1],$left,$top,$width).
Here's a better way to do it :
#include <GUIConstants.au3>
#include <ButtonConstants.au3>
Global $AllButtons[4] = ["3","Button1","Button2","Bouton3"]
GuiCreate ("Title", 120, 200)
$Btn_Start = GUICtrlCreateDummy()
For $i = 1 To $AllButtons[0]
local $top = $i*40
local $left = 10
local $width = 100
GUICtrlCreateButton($AllButtons[$i],$left,$top,$width)
Next
$Btn_End = GUICtrlCreateDummy()
GUISetState ()
While 1
$Msg = GUIGetMsg()
Switch $msg
Case $GUI_EVENT_CLOSE
Exit
Case $Btn_Start To $Btn_End
MsgBox(0, "Test", GUICtrlRead($Msg))
EndSwitch
Wend