Email are not sending.

This is my code of sending email but it gives error "Multiline found" instead of sending email.

case 5: // email for sending different report attachments //


 
  ////// attachment header ///////////////////////////////
     $headers = array();
   $headers[] = "MIME-Version: 1.0";
   $headers[] = "From: cashxcash.com<{$sender}>";
   $headers[] = "Content-Type: multipart/mixed; boundary=\"{$uid}\"";
   $headers[] = "This is a multi-part message in MIME format.";
   $headers[] = "--{$uid}";
   $headers[] = "Content-type:text/plain; charset=iso-8859-1"; // Set message content type
   $headers[] = "Content-Transfer-Encoding: 7bit";
   $headers[] = ""; // Dump message
   $headers[] = "--{$uid}";
   $headers[] = "Content-Type: application/octet-stream; name=\"{$fileName}\""; // Set content type and file name
   $headers[] = "Content-Transfer-Encoding: base64"; // Set file encoding base
   $headers[] = "Content-Disposition: attachment; filename=\"{$fileName}\""; // Set file Disposition
   $headers[] = $encoded_content; // Dump file
   $headers[] = "--{$uid}--"; //End boundary
 
return mail($reciever,"{$variables['emailContains']} Report from Cashxcash!","", implode("\r\n", $headers) );
break;