Hello Jon,
The error is indicating a missing data field. Please make sure that you have set the
Data Source Component to appropriate data item (report itself, Table, List, Crosstab, Chart) and that the DataSource component (SQLDataSource component) is having a Exp1 field.
For further assistance we will appreciate if you send a sample project that exhibits the error you have experienced.
Regards,
Peter
the Telerik team
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