Outlook VBA - Error 424 Object Required error - but I can't work out why - vba

Question

We get hundreds of invoices emailed in per day - all are PDF format, and for most members of my dept, they're doing nothing more than marking them as read and moving them to a folder. My folder is called "invoices" and is a subfolder to my Inbox. I have written the following code, it throws an error 424 on the lines:
Set myInbox = myNameSpace.GetDefaultFolder(olFolderInbox)
All I'm trying to do is check if an email is unread and has a pdf attachment, then move it to my "invoices" folder. Code follows:
Sub Lazy()
On Error GoTo Lazy_err
' Declare the variables
Dim ns As NameSpace
Dim myInbox As Outlook.Folder
Dim myDestFolder As Outlook.Folder
Dim Item As Object
Dim Atmt As Attachment
Dim i As Integer
' Set variables
Set ns = GetNamespace("MAPI")
Set myInbox = myNameSpace.GetDefaultFolder(olFolderInbox)
Set myDestFolder = myInbox.Folders("invoices")
i = 0
' If statement to check if there's any unread emails in the box
If Inbox.UnReadItemCount = 0 Then
MsgBox "There are no unread messages in your Inbox.", vbInformation, _
"Nothing Found"
Exit Sub
End If
For Each Item In Inbox.Items
If Item.UnRead = True Then
For Each Atmt In Item.Attachments
If Right(Atmt.FileName, 3) = "pdf" Then
myItem.Move myDestFolder
Item.UnRead = False
i = i + 1
End If
Next Atmt
' close off If statements, then move to next item and start again
End If
Next Item
' Display a summary message!
If i > 0 Then
MsgBox "I found " & i & " emails." _
& vbCrLf & "I have moved them into the correct folder." _
& vbCrLf & vbCrLf & "Maybe double check to make sure nothing else has been moved?", vbInformation, "Finished!"
Else
MsgBox "There's nothing to find", vbInformation, _
"Finished!"
End If
' Housekeeping - reset everything for next time macro is run
Lazy_exit:
Set Atmt = Nothing
Set Item = Nothing
Set ns = Nothing
' Exit the macro :)
Exit Sub
' Error Handler - goes at very end of script, even after "exit sub"
Lazy_err:
MsgBox "An unexpected error has occurred." _
& vbCrLf & "Please note and report the following information." _
& vbCrLf & "Macro Name: SaveAttachments" _
& vbCrLf & "Error Number: " & Err.Number _
& vbCrLf & "Error Description: " & Err.Description _
, vbCritical, "Error!"
Resume Lazy_exit
End Sub

Answer 1

First of all, you need to correct the namespace variable name as Paul suggested:
' Set variables
Set ns = GetNamespace("MAPI")
Set myInbox = ns.GetDefaultFolder(olFolderInbox)
Then I have noticed the following lines of code:
For Each Item In Inbox.Items
If Item.UnRead = True Then
Don't iterate over all items in the folder. It will take a lot of time and may cause issues related to not releasing objects in time. Use the Find/FindNext or Restrict methods of the Items class instead. You can read more about these methods in the following articles:
How To: Use Find and FindNext methods to retrieve Outlook mail items from a folder (C#, VB.NET)
How To: Use Restrict method to retrieve Outlook mail items from a folder

Answer 2

You have created/initialized a Namespace Object variable ns, but not myNameSpace. Make sure you modify your code to reference appropriate objects.
Sub Lazy()
On Error GoTo Lazy_err
' Declare the variables
Dim ns As NameSpace
Dim myInbox As Outlook.Folder
Dim myDestFolder As Outlook.Folder
Dim Item As Object
Dim Atmt As Attachment
Dim i As Integer
' Set variables
Set ns = GetNamespace("MAPI")
Set myInbox = ns.GetDefaultFolder(olFolderInbox)
'Code continues...