Summary
Error when executing the BIP report
Content
Hi All,
I have created a BIP report with RTF template, which works fine most of the time but suddenly stops working with the below error:

Checked the log but it contains the same Warning with not much details. Any pointers to why and when we get this error?
The template is validated and contains no Errors. Sources used in Data Model are SQL and Analysis. The BIP report is placed on a Dashboard and a presentation variable is passed as parameter to the data model and all the reports.
Any pointers will really be helpful. Thank you.
Version: Oracle Business Intelligence 11.1.1.9.160719
Oracle BI Publisher 11.1.1.9.160719 (build:20160622.0617)