Invoice Barcode Not Printing

I am having trouble printing invoice barcodes. The barcodes show up on the order page, but when sending the invoice to print or pdf, the barcode is not visible and it does not print. I looked in settings and everything seems fine for the barcode to be used and to print. Any clues?

Problem solved. The image needed to be added to the invoice in the document section.

thanks for sharing the answer

I am facing the exact same problem (v4.7.4)

What do you mean "The image needed to be added to the invoice in the document section." ?

Please check image below

http://prntscr.com/juxcy8

thanks again eComLabs