As Don said, you are being very stingy on the important details. But I can tell you the following:
The error is being sent from the database client and it is totally unmodified by the report engine. E.g.; check out your database documentation for the error. Else google the error. I did, and the following may be of interest to you:
If the above does not resolve the issue, do google the error, do consult your database documentation.
And for next time, providing some minimal information re. the environment will be very appreciated 
Have a great weekend,
- Ludek
Senior Support Engineer AGS Product Support, Global Support Center Canada
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