When previewing a report, you get the following error:
GrapeCity.ActiveReports.ReportDataException: A Command Text has not been set.
This error is simpler than it sounds to fix. It is caused by a data set in the report not having a query.
1. To fix it, right-click your data sets
2. Select Edit
3. Check the Query tabs to make sure all data sets have a query
4. You should find that at least one does not have a query associated with it, hence the error occurring