SendUsing Configuration Value is Invalid Error in VB Script

I get an error on line 120 of the following script. It says the SendUsing Configuration Value is Invalid, Code: 80040220, Source: CDO.Message.1. I found this script on the net and was hoping to use it for email notification. Please help, I'm pretty new to this! Thanks!

Option Explicit

Dim objCommand, objConnection, objChild, objUserConnection, strBase, strFilter, strAttributes, strPasswordChangeDate, intPassAge
Dim lngTZBias, objPwdLastSet, strEmailAddress, objMessage
Dim objShell, lngBiasKey, k, PasswordExpiry, strRootDomain
Dim strQuery, objRecordset, strName, strCN

' ********************* CHANGE THESE VALUES TO PASSWORD EXPIRY AND ROOT OF WHERE USERS WILL BE SEARCHED ***********************************

PasswordExpiry=90
strRootDomain="OU=users,OU=OU,OU=OU,DC=corp,DC=domain,DC=com"

' *****************************************************************************************************************************************

' Obtain local Time Zone bias from machine registry.
Set objShell = CreateObject("Wscript.Shell")
lngBiasKey = objShell.RegRead("HKLM\System\CurrentControlSet\Control\TimeZoneInformation\ActiveTimeBias")
If UCase(TypeName(lngBiasKey)) = "LONG" Then
lngTZBias = lngBiasKey
ElseIf UCase(TypeName(lngBiasKey)) = "VARIANT()" Then
lngTZBias = 0
For k = 0 To UBound(lngBiasKey)
lngTZBias = lngTZBias + (lngBiasKey(k) * 256^k)
Next
End If

Set objCommand = CreateObject("ADODB.Command")
Set objConnection = CreateObject("ADODB.Connection")
objConnection.Provider = "ADsDSOObject"
objConnection.Open "Active Directory Provider"
objCommand.ActiveConnection = objConnection
strBase = ""

strFilter = "(&(objectCategory=person)(objectClass=user)(!userAccountControl:1.2.840.113556.1.4.803:=2)(!userAccountControl:1.2.840.113556.1.4.803:=65536))"
strAttributes = "sAMAccountName,cn,mail,pwdLastSet,distinguishedName"
strQuery = strBase & ";" & strFilter & ";" & strAttributes & ";subtree"
objCommand.CommandText = strQuery
objCommand.Properties("Page Size") = 100
objCommand.Properties("Timeout") = 30
objCommand.Properties("Cache Results") = False
Set objRecordSet = objCommand.Execute

' WScript.echo "Running at " & Date()

Do Until objRecordSet.EOF
strName = objRecordSet.Fields("sAMAccountName").Value
strCN = objRecordSet.Fields("cn").value
strEmailAddress = objRecordSet.Fields("mail").value
Wscript.Echo "NT Name: " & strName & ", Common Name: " & strCN

Set objUserConnection = GetObject("LDAP://" & objRecordSet.Fields("distinguishedName").Value)
Set objPwdLastSet = objUserConnection.pwdLastSet
strPasswordChangeDate = Integer8Date(objPwdLastSet, lngTZBias)
WScript.Echo vbTab & "Password last changed at " & strPasswordChangeDate
intPassAge = DateDiff("d", strPasswordChangeDate, Now)
WScript.Echo vbTab & "Password changed " & intPassAge & " days ago"

If intPassAge = (PasswordExpiry-1) Then
WScript.echo vbTab & "Sending user notification to " & strEmailAddress & " that password expires in 1 day"
Call SendEmailMessage(strEmailAddress, 1)
ElseIf intPassAge = (PasswordExpiry-2) Then
WScript.echo vbTab & "Sending user notification to " & strEmailAddress & " that password expires in 2 days"
Call SendEmailMessage(strEmailAddress, 2)
ElseIf intPassAge = (PasswordExpiry-3) Then
WScript.echo vbTab & "Sending user notification to " & strEmailAddress & " that password expires in 3 days"
Call SendEmailMessage(strEmailAddress, 3)
ElseIf intPassAge = (PasswordExpiry-6) Then
WScript.echo vbTab & "Sending user notification to " & strEmailAddress & " that password expires in 6 days"
Call SendEmailMessage(strEmailAddress, 6)
ElseIf intPassAge = (PasswordExpiry-9) Then
WScript.echo vbTab & "Sending user notification to " & strEmailAddress & " that password expires in 9 days"
Call SendEmailMessage(strEmailAddress, 9)
End If

objRecordSet.MoveNext
Loop

objConnection.Close

Function Integer8Date(objDate, lngBias)
' Function to convert Integer8 (64-bit) value to a date, adjusted for
' local time zone bias.
Dim lngAdjust, lngDate, lngHigh, lngLow
lngAdjust = lngBias
lngHigh = objDate.HighPart
lngLow = objdate.LowPart
' Account for error in IADslargeInteger property methods.
If lngLow < 0 Then
lngHigh = lngHigh + 1
End If
If (lngHigh = 0) And (lngLow = 0) Then
lngAdjust = 0
End If
lngDate = #1/1/1601# + (((lngHigh * (2 ^ 32)) _
+ lngLow) / 600000000 - lngAdjust) / 1440
' Trap error if lngDate is overly large
On Error Resume Next
Integer8Date = CDate(lngDate)
If Err.Number <> 0 Then
On Error GoTo 0
Integer8Date = #1/1/1601#
End If
On Error GoTo 0
End Function

Sub SendEmailMessage(strDestEmail, strNoOfDays)
Set objMessage = CreateObject("CDO.Message")
objMessage.Subject = "Password Expires in " & strNoOfDays & " days"
objMessage.From = "cltpwdadmin@tylertech.com"
objMessage.To = strDestEmail
objMessage.TextBody = "Your password expires in " & strNoOfDays & " days. Please go to Outlook Web Access and click on Options to change your password"
objMessage.Send
End Sub