The error which you are getting is because of the connection. Its not with the syntax. When the connection fails, no data is retrieved and hence "Store SALES_DATA_SUMMARY into [lib://SALES_DATA_SUMMARY.qvd] (qvd)" statement would through an error because the table SALES_DATA_SUMMARY does not exist.
i would suggest you to check your data connection and make sure your connection string is embedded before the load statement.
If you can post the code which you are trying to execute, it would be easier to solve the issue.