First try to pull the data from DB then store as QVD.
Best Anil, When applicable please mark the correct/appropriate replies as "solution" (you can mark up to 3 "solutions". Please LIKE threads if the provided solution is helpful
On average, multiple reload jobs can read a single QVD all at the same time without any problems. But a QVD cannot be rewritten when someone else is still reading data from it. Check which tasks are accessing this QVD simultaneously, and reorganise your task chains so that every Readers waits for the Writer to finish.
It could also be an anti-virus scanner, or some other process that isn't directly connected to QlikView acitivities.
I was getting the same error. To fix this, the user running the script should have permission to access that folder where the QVD's are stored. Go to the folder, right-click and open properties. Go to security and add the user to the users list and give that user permissions to that folder
