Post-processing of request * failed * with the error message

Hi All,

One of my BI Publisher report (Query built in Data Definition *.xml file and Excel Template design files) is failing with following errors:

+--------- 1) POST-PROCESSING ---------+

Beginning post-processing of request *** on node *** at 14-JAN-2020 05:01:26.

-- Publishing output

Post-processing of request *** failed at 14-JAN-2020 05:01:27 with the error message:

One or more post-processing actions failed. Consult the OPP service log for details.

CONC-POST-PROCESSING RESULTS

-- PUBLISH:

oracle.apps.fnd.cp.opp.PostProcessorException: oracle.apps.fnd.cp.opp.PostProcessorException: oracle.apps.xdo.XDOException

+---------------------------------------+

What is the possible fix for this type of issue ? How do we debug ?

Thanks,