HELP : ODBC's physical-order read error message

I am writing a program in Visual Basic 3.0 Professional Edition and the program gets its data from the Informix database. The program usually used the following statement to get a list of values from the Informix database : Set qdata = db.Createdynaset(q1) *where qdata and db is declared as dynaset and database respectively. The q1 holds the SQL statement. Sometimes it works and returns a dynaset of values read from the Informix database but sometimes the following error message appears when it tries to execute the same statement mentioned : ODBC-call failed. [Q+E Software] [ODBC Informix driver] [Informix] Could not do a physical-order read to fetch next row. [#-244] What does this error message mean? Can anybody help me on this? I'm stuck with this problem for sometime now. I am linked to the Informix database via Intersolv Q+E MultiLink. Thanks in advance. Alex.