Error 440 "Array Index out of Bounds" - vba

Question

I am trying to download an Excel attachment with the subject keyword.
I managed to create a code but sometimes it is giving Error 440 "Array Index out of Bounds".
The code got stuck in this part.
If Items(i).Class = Outlook.OlObjectClass.OlMail Then
Here is the code
Sub Attachment()
Dim N1 As String
Dim En As String
En = CStr(Environ("USERPROFILE"))
saveFolder = En & "\Desktop\"
N1 = "Mail Attachment"
If Len(Dir(saveFolder & N1, vbDirectory)) = 0 Then
MkDir (saveFolder & N1)
End If
Call Test01
End Sub
Private Sub Test01()
Dim Inbox As Outlook.Folder
Dim obj As Object
Dim Items As Outlook.Items
Dim Attach As Object
Dim MailItem As Outlook.MailItem
Dim i As Long
Dim Filter As String
Dim saveFolder As String, pathLocation As String
Dim dateFormat As String
Dim dateCreated As String
Dim strNewFolderName As String
Dim Creation As String
Const Filetype1 As String = "xlsx"
Const Filetype2 As String = "xlsm"
Const Filetype3 As String = "xlsb"
Const Filetype4 As String = "xls"
Dim Env As String
Env = CStr(Environ("USERPROFILE"))
saveFolder = Env & "\Desktop\Mentor Training\"
Set Inbox = Application.GetNamespace("MAPI").GetDefaultFolder(olFolderInbox)
'If Inbox.Items.Restrict("[UnRead] = True").Count = 0 Then
' MsgBox "No Mentor Training Mail In Inbox"
' Exit Sub
'End If
Filter = "#SQL=" & Chr(34) & "urn:schemas:httpmail:datereceived" & _
Chr(34) & " >= '4/2/2017' AND " & _
Chr(34) & "urn:schemas:httpmail:hasattachment" & _
Chr(34) & "=1 AND" & Chr(34) & _
Chr(34) & "urn:schemas:httpmail:read" & _
Chr(34) & "= 0"
Set Items = Inbox.Items.Restrict(Filter)
For i = 1 To Items.Count
If Items(i).Class = Outlook.OlObjectClass.olMail Then
Set obj = Items(i)
Debug.Print obj.subject
For Each Attach In obj.Attachments
If Right(LCase(Attach.fileName), Len(Filetype1)) = Filetype1 Then 'For searching only excel files
dateFormat = Format(obj.ReceivedTime(), "dd-mm-yyyy hh-mm")
Attach.SaveAsFile saveFolder & "(" & dateFormat & ")" & " " & Attach
End If
If Right(LCase(Attach.fileName), Len(Filetype2)) = Filetype2 Then 'For searching only excel files
dateFormat = Format(obj.ReceivedTime(), "dd-mm-yyyy hh-mm")
Attach.SaveAsFile saveFolder & "(" & dateFormat & ")" & " " & Attach
End If
If Right(LCase(Attach.fileName), Len(Filetype3)) = Filetype3 Then 'For searching only excel files
dateFormat = Format(obj.ReceivedTime(), "dd-mm-yyyy hh-mm")
Attach.SaveAsFile saveFolder & "(" & dateFormat & ")" & " " & Attach
End If
If Right(LCase(Attach.fileName), Len(Filetype4)) = Filetype4 Then 'For searching only excel files
dateFormat = Format(obj.ReceivedTime(), "dd-mm-yyyy hh-mm")
Attach.SaveAsFile saveFolder & "(" & dateFormat & ")" & " " & Attach
End If
obj.UnRead = False
DoEvents
obj.Save
Next
End If
Next
MsgBox "Attachment Saved"
End Sub

Answer 1

It was my understanding that arrays in vba started at 0 by default. So if there is only one item in the list it will be located at Items(0). And since your for statement starts by looking at Items(1) it will throw that error. Changing it to:
For i = 0 To Items.Count - 1
should work I believe.

Answer 2

The filter may return zero items.
Set Items = Inbox.Items.Restrict(Filter)
If Items.Count > 0 then
For i = 1 To Items.Count

Answer 3

No need for setting up multiple dot objects simply use
If Items(i).Class = olMail Then
You may also wanna set your objects to nothing, once your done with them...
Set Inbox = Nothing
Set obj = Nothing
Set Items = Nothing
Set Attach = Nothing
Set MailItem = Nothing
End Sub