VBScript runtime error: Wrong number of arguments or invalid property assignment

I'm trying to get the last known user that logged in using WMI. I've added a few statements to be sure I'm sending the right info but I'm still getting the same error msg: Microsoft VBScript runtime error: Wrong number of arguments or invalid property assignment: 'GetLastUserToLogin'.

Thanks!!

Dim counter
Dim objWMIService, objComputer, colComputer, strComputer
Dim Excel, objOU, objFSO, objNtSecurityDescriptor, objUSer

Function DoRecursive(strObjectDN)
  
'Set oneLevelOU= GetObject("LDAP://" & strObjectDN)
Set objOU = GetObject("LDAP://" & strObjectDN)
objOU.Filter = Array("Computer")

Set objUser = GetObject("LDAP://" & strObjectDN)	
Set objFSO = CreateObject("Scripting.FileSystemObject")

For Each objComputer In objOU
Set objNtSecurityDescriptor = objComputer.Get("ntSecurityDescriptor")	 

    Excel.Cells(counter,1).Value = objComputer.CN
    Excel.Cells(counter,2).Value = objComputer.OperatingSystem
    Excel.Cells(counter,3).Value = objNtSecurityDescriptor.owner
    Excel.Cells(counter,4).Value = objComputer.WhenCreated
    Excel.Cells(counter,5).Value = GetLastUserToLogin  **Error Occurs Here***
    counter =counter +1    

Next
End Function

Function GetLastUserToLogin(strComputer)
	If Ping(strComputer) = True Then
		strUserName = ""
		On Error Resume Next
		Set objWMIService = GetObject("winmgmts:" _
		    & "{impersonationLevel=impersonate}!\\" & strComputer & "\root\cimv2")
		Set colComputer = objWMIService.ExecQuery _
		    ("Select UserName from Win32_ComputerSystem")
		For Each objComputer in colComputer
			strUserName = objComputer.UserName
		Next
		If Err.Number <> 0 Then strUserName = "WMI ERROR"
		Err.Clear
		On Error GoTo 0
	Else
		strUserName = "OFFLINE"
	End If
	GetLastUserToLogin = strUserName
End Function

Function Ping(strComputer)
	Dim objShell, boolCode
	Set objShell = CreateObject("WScript.Shell")
	boolCode = objShell.Run("Ping -n 1 -w 300 " & strComputer, 0, True)
	If boolCode = 0 Then
		Ping = True
	Else
		Ping = False
	End If
End Function