I have added new categories to my Magento Shop but when I try to update Linnworks Desktop via the Magento Configurator, I get the following error message

"Unrecognised message version"

So the new categories from Magento are not brought into Linnworks so can't list products in these categories.  

Also when I try to create a new Magento configurator I get the following error message

"Could not download attribute set.  Check on the back end that the attribute set is a valid one and try to click "update" again. Unrecognized message version. "

We are running Magento 1.91 and Linnworks Desktop with the latest updates.  We have not changed any attributes on Magento so do not understand why this is happening.

Can anyone advise how to solve these problems.

Many Thanks

Also getting this error when trying to list any product on the Magento 1.9.1 website on an existing category :

"Could not download attribute set.  Check on the back end that the attribute set is a valid one and try to click "update" again. Unrecognized message version. "

Totally unable to list products now on Magento from Linnworks Desktop Application

Stock levels are also not updating on Magento as well as Amazon

Fruugo Not Syncing either error message:

2017-01-26 11:18:45 Fruugo Listings : System.MissingFieldException: Field not found: 'linnworks.finaware.CommonData.Classes.Fruugo.FruugoConfig.UpdateStockUrl'.

   at linnworks.syncworker.fruugoInventory.Base.SyncInventory(FruugoConfig config, String connectionString)

   at linnworks.syncworker.fruugoInventory.Base.Init(Object param)