Barcode generation from tally software is not working properly from Aloof RDP setup.
Since there are no official troubleshooting documents, I recommend studying the available ones at: http://www.alooftech.com/downloads/Documents/
I've also checked what you've said, but nothing could be found. It means it's a localized error. I recommend checking the available settings for the application, then use the link below to contact the developers: http://www.alooftech.com/Pages/Contact.aspx