Emailing with attachment

I have ventured into unknown waters and now my head hurts, I could really use some help. Here is the idea, I have an online form(internal) to report an incident, user submits form, php writes it to db, then builds pdf and emails the pdf to me. I am using FPDF for my pdf generation. Now the problem is, the attachment is empty and gives me an error that the file may not have been decoded correctly or not a supported file type.

Email code:

// email stuff (change data below)
$to = "me@somewhere.com";
$from = "webmaster@somewhere.com";
$subject = "Online Event Submission";
$message = "<p>Please see the attachment.</p>";
 
// a random hash will be necessary to send mixed content
$separator = md5(time());
 
// carriage return type (we use a PHP end of line constant)
$eol = PHP_EOL;
 
// attachment name
$setTime = time();
$setDate = date('M j, Y');
$filename = "Incident.pdf";
 
// encode data (puts attachment in proper format)
$pdfdoc = $pdf->Output("", "S");
$attachment = chunk_split(base64_encode($pdfdoc));
 
 
// main header (multipart mandatory)
$headers = "From: ".$from.$eol;
$headers .= "MIME-Version: 1.0".$eol;
$headers .= "Content-Type: multipart/mixed; boundary=\"".$separator."\"".$eol.$eol;
$headers .= "Content-Transfer-Encoding: 7bit".$eol;
$headers .= "This is a MIME encoded message.".$eol.$eol;
 
// message
$headers .= "--".$separator.$eol;
$headers .= "Content-Type: text/html; charset=\"iso-8859-1\"".$eol;
$headers .= "Content-Transfer-Encoding: 7bit".$eol.$eol;
$headers .= $message.$eol.$eol;
 
// attachment
$headers .= "--".$separator.$eol;
$headers .= "Content-Type: application/octet-stream; name=\"".$filename."\"".$eol;
$headers .= "Content-Transfer-Encoding: base64".$eol;
$headers .= "Content-Disposition: attachment".$eol.$eol;
$headers .= $attachment.$eol.$eol;
$headers .= "--".$separator."--";
 
// send message
mail($to, $subject, "", $headers);

PHP:

Any help is appreciated, thanks for taking the time to read.

Rob