Strange Error In Lookup Component

Hi,

I am getting this error in a Lookup component:

Error: 0xC020901E at Load_tblDelayfact, Lookup_DL_CODE [184]: Row yielded no match during lookup.

Error: 0xC0209029 at Load_tblDelayfact, Lookup_DL_CODE [184]: The "component "Lookup_DL_CODE" (184)" failed because error code 0xC020901E occurred, and the error row disposition on "output "Lookup Output" (186)" specifies failure on error. An error occurred on the specified object of the specified component.

Although the Lookup table is filled in with the following SELECT ststement:

SELECT DISTINCT DL_CODE, DL_COMMENT
FROM DL_Temp AS T1

WHERE NOT EXISTS(

SELECT * FROM DL_CODE AS T2
WHERE
T1.DL_CODE = T2.DL_CODE
AND
T1.DL_COMMENT = T2.DL_SENT_COMMENT

)

So there is no way that there is a record in DL_Temp (The data source) that does not exist in DL_CODE( the lookup table). Indded, I did serveral queries and tests to check that no such data exist and I found that no such record exists.

Please help me and tell me what can be the reason for this error. I used the same package on the same data yesterday and every thing went fine. Is that a bug that any of you faced before.

Thanks,

Aref