Shared Calendar stops email syncing to Devices

Got a wierd one for you, I have a user who published a shared calendar with a group of users within Groupwise 2014.

proxy'd to the email account
right click on the calendar
sharing...added the users
ticked edit and delete
clicked on ok

As soon as the user added the Calendar to their Groupwise and sync through to GMS, I statrted getting this error in the groupwise-agent.log

2016-08-30 13:47:06.514 INFO [WORKERS_POOL_Thread-4] [gwconnectorlogic:840] [userID:atest] [eventID:] [objectID:] [CheckPoint] Received event from GroupWise of type "FolderAdd"
2016-08-30 13:47:06.537 ERROR [WORKERS_POOL_Thread-4] [gwsoap:533] [userID:atest] [eventID:] [objectID:] [] Failure parsing soap response. Response string: None; Exception: Type not found: 'gwt:shareTree'

as soon as the I got the users to delete the shared calender email starting coming through again to their mobile devices.

We currently run users on two versions of GMS Version: 14.2.0 Build: 279 and Version: 2.1.0 Build: 230, any help on this will be appreciated as I am stuck as to why this is happeing