An attempt was made to open a result set with a column of unknown data type. In most cases, the ODBC driver is capable of recognizing all data types supported by the version of back-end that is being accessed. This error can occur when the driver does not recognize one of the returned data types.
For more information, consult the documentation for the data source from which the column data originated. For example, consult the DRVSSRVR.HLP file for detailed information on the SQL Server driver.