asp error: Arguments are of the wrong type.....

[jamesa74]

My asp performs a query on a mdb file. sometimes it works, somtimes i get the message:
"Error Type:
ADODB.Recordset (0x800A0BB9)
Arguments are of the wrong type, are out of acceptable range, or are in conflict with one another.
/admin.asp, line 17"

might it be a IIS 5.0 problem???