Thank you for your post.
Performing a quick browser search, I found the following that may help you with the CNS barcode application:
This link appears to "walk you through the very simple process of integrating CNS Barcode with FileMaker Go".
Thanks for your reply and apologies for not responding sooner. I thought I would get a notification if someone posted here. That was the tutorial that I initially followed. I have since been in touch with the CNS guys and worked out the issue. Every time I opened a new instance of the database on FM GO, the app appended a number to the end of the file. Therefore the scripts were only referencing the original file. I cleared out all my files list and tried again and it worked.