After changing the date format, the report download works fine. Thanks again Jerry. Thank you all for your valuable inputs, I will try and convince the customer as well to upgrade to 11.1.1.9.x version.

For testing purpose, I removed all the date fields and voila, the error is gone. thanks Jerry. Now I will need to verify which of those 10 date fields is causing the issue. I shall update this thread once I have the problem solved.

Thanks for the update Sherry but customer won't agree for upgrade due to issue in one report. Debugging steps I followed were to delete columns one by one and it would work in some case by deleting column X and then by deleting by column Y and so on. But when remove the culprit column from the main report, it still errors…

Thank you for the response, I shall try and update as I have at least 10 date fields in the report.

11.1.1.7.160719 (Build 160701.0659 64-bit)

11.1.1.7.160719 (Build 160701.0659 64-bit)