Can't execute empty rdoPreparedStatement (Error 40018)

A Null or empty string was encountered in the SQL property of rdoPreparedStatement or rdoQuery object during the invocation of the Execute method.

To avoid this error, make sure the SQL statement for the rdoPreparedStatement or rdoQuery object is valid, either by passing it as an argument to CreatePreparedStatement or CreateQuery, or by setting the SQL property of the rdoPreparedStatement or rdoQuery object.