Dropbox token is empty on Linnworks

[rockcollection]

We use stock control software called Linnworks. Today, when uploading a file (as I have done for many years) I now receive an error stating "Dropbox token is empty". I've tried to reconfigure permissions but with no joy. Linnworks say the issue is with Dropbox. Any ideas would be greatly appreciated. 

[Greg-DB]

The error message "Dropbox token is empty" isn't from Dropbox itself, so it sounds like this is an error message written by Linnworks. That being the case, Linnworks will need to provide some guidance on that. If they have found an issue with the Dropbox API itself, they should contact us directly with the relevant technical details so we can investigate.

[rockcollection]

Thanks Greg, much appreciated. I'll pass that info back to them.