base elements script step 'BE_SMTPsend' with an attachment fails

[tomp]

I'm having a problem getting BE_SMTPsend to successfully send an email with an attachment.

No problem sending without an attachment, but when I add an attachment, I get an error 2 (not sure exactly what that means, but without the attachment, no error)

These are the argument strings with and without attachments:

I have tried both relative and direct file paths for the variable $attachment. Examples are:

Both of them return an error code of 2.

Since the 'send' without an attachment works, all the values of the fields/variables other than $attachment must be valid.

Can anyone offer a suggestion as to what might be going on and what I might try to resolve this?