NPrinting On Demand with QlikView - Uncaught TypeError: Cannot read property 'lang' of undefined

Description of Issue:

• Upgraded our NPrinting server to Feb 2019 Initial Release and can no longer access on-demand reports from dashboards via the QlikView Access Point.
• Upgraded to the April 2019 Release which contains the 'fix' and still have same issue
• No errors appear in the GUI, however, the On-Demand screen is blank.
• When using Dev Tools the following error appears: Uncaught TypeError: Cannot read property 'lang' of undefined

After Upgrading to April 2019:

• The browser in some cases may have cached the previous On Demand Add-on and must be cleared to allow the new add-on to work normally.
• The new add on for the April 2019 version has not been installed/updated

Fix and workaround information

• Ensure that you have upgraded your NPrinting On Demand components to April 2019 release to match the NPrinting April 2019 server
• If the issue persists after upgrading to April 2019 Release, you simply need to clear your browser cache and restart your browser.

• 12.20 and 12.30: Change the default language by editing the Settings.ini file. Directions found here: https://community.qlik.com/t5/QlikView-App-Development/Change-Access-Point-Language/td-p/507848
• 11.20 and 12.10: The only found workaround is to manually add the language in the URL (e.g. add to Access Point URL  &lang=en-US). For example: Change http://QlikViewAccessPoint/QvAJAXZfc/opendoc.htm?document=QlikViewApp.qvw&host=QlikViewServer to http://QlikViewAccessPoint/QvAJAXZfc/opendoc.htm?document=QlikViewApp.qvw&host=QlikViewServer&lang=en-US
• QV 12.0: Not Supported by the Add-On
• This issue is confined to NPrinting On Demand with QlikView