If you can not successfully run a query, most likely one or more of the database objects that are specified in the query has been updated. For example, a table name has changed, or a column has been deleted from a table since the last time you ran the prompted query. You cannot make the changes to the query from within QMF. You must convert or export the query to change it.
To correct the information in the query: Convert the prompted query to a SQL query, display the query, and make the changes. See Converting a prompted query to an SQL query for information on converting a prompted query to an SQL query.