Clarity PPM: Jaspersoft Report Run from Reports and Jobs page gives RPT-0020 Error

Document ID : KB000125267
Last Modified Date : 25/01/2019
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When running reports from the Home > Reports and Jobs > Reports page such as the Project Storyboard report, 
the following error is shown:

RPT-0020: Error occurred while downloading the report. Please contact your system administrator.

This happens with with any type of file being rendered/selected such as a PDF or Excel file.

The report runs fine when executed from the Home > Advanced Reporting page.

It happens only in one environment, but not another.
The last environmental change was a refresh from one environment to  another, where the refreshed environment is the one affected.

The Jaspersoft service is hanging, non-responsive.
Please contact the Support team to restart the Jaspersoft services.