ORA-43908
invalid output data type
Cause
An invalid output data type was provided. The valid output data types for VALIDATE_CONVERSION operator and the operators supporting DEFAULT ON CONVERSION ERROR syntax are: NUMBER, BINARY_FLOAT, BINARY_DOUBLE, DATE, TIMESTAMP, TIMESTAMP WITH TIME ZONE, INTERVAL DAY TO SECOND, INTERVAL YEAR TO MONTH.
Action
Provide a valid output data type.