The refresh process is thru a task on the publisher and yes the repository wherever the qvd is to be stored the QV has access to read/write.
The task failed once then after the next refresh everything seems to be fine. Even this morning the task refreshed successfully.
I agree to the point that this is a generic error, any help on this to identify the cause would be appreciated.
To what ASHFAQ has mentioned not sure how far would that be a stable solution.
Thanks to everyone.
One thing that I've experienced in the past is that whenever you drag QVD file into qvw for any purpose and you left the qvw file open, QlikView will complain next refresh and you want to store new data into the QVD (i.e. incremental).
So ensure that no QVD file is not locked in anyway (i.e dragging).
Also ensure that all developers close down all QVW files before going home each day.
Hope this helps.