Exception processing email attachments

scrubbedName = FileAndPathNameIllegalCharUtility.CreateSafeFileName(att.Name, out scrubbedName, scrubOptions);                    if (scrubbedName.IsNotNullOrEmpty())                    {                        att.Name = scrubbedName;  //Exception here                        //Good attachment name add to a list for processing                        attachments.Add(att);                    }

Characters removed by CreateSafeFileName (URI_ILLEGAL_CHARS = { '@', '"', '$', '&', ':', '<', '>', '{', '}', '[', ']',

 '#', '%', '/', ';', '=', '?', '\\', '^', '|', '~', '\'', '\"' };

StackTrace-

   at
System.Globalization.EncodingTable.internalGetCodePageFromName(String name)
   at
System.Globalization.EncodingTable.GetCodePageFromName(String name)
   at
System.Text.Encoding.GetEncoding(String name)
   at
#=q_60aBNxG2$SuXCZfZj8RxMuQ4QvMCxRRNzSjx5tNaig=.#=qMYQy_hVHueJdS6Pxw7GcW6PqRwLc9ouD2xur1bMlMIg=(String
#=qRIDVWGAM$0BkCBJQsYmZAw==)
   at
Aspose.Email.Mime.ContentDisposition.get_FileName()
   at
Aspose.Email.Mail.Attachment.#=qjNb7XloW0J8_3iKnFFn9wvb23aHjAydf$MMzPynAANM=(Boolean&
#=qJg7wl47f7hGQvPeIF4FbAsdWdbO_jXQy7EOPmbLH5wM=)
  at
Aspose.Email.Mail.Attachment.#=qKmpcowkezBlTXeK44UnmdLVLTH_u7dGPaJWEJTJIVBQ=(String
#=q7G9LZy5KsRJ$RaSgKMwaRg==)
   at
Aspose.Email.Mail.Attachment.set_Name(String value)
   at
Hyland.Core.SubscriptionServer.Module.CheckForAttachment(MailMessage message,
List`1 attachments, IllegalCharacterScrubOptions scrubOptions) in
M:\TFS\DEV\Core\OnBase.NET\Libraries\Hyland.Core\SubscriptionServer\Module.cs:line
1313
Thank you,

Cameron