Could be that the QVD your trying to store is locked by another QVW for some reason.
Try closing all QVW files or use windows to see which files are locked (forgot how to actually see where to see the file handlers in windows).
There's no limit for the store and your table is quite small and should be stored quickly, so I imagine is something with the OS locking the file.
I've opened only one file but everytime that i launch the reload the script works well till the store, but it isn't able to store the table.
I've tried to store another table in the same path and it has worked fine.
I've tried also to store the table with the problem in another path but it doesn't work.
There is a problem with this table surely but i don't know what.