Oracle Message ORA-24437 - OCIStmtExecute called before OCIStmtPrepare2.

ERROR	OCIStmtExecute called before OCIStmtPrepare2.
CAUSE	An attempt was made to execute a statement without first preparing it using OCIStmtPrepare2.
ACTION	Call OCIStmtPrepare2 before OCIStmtExecute.