This link (https://enterprise-architecture.org/os_download.php) has two installations, 1) Essential In a Box, and 2) Standalone Install. My initial installation was the Essential In a Box which generated the error importing the dup. I installed Standalone and was able to successfully import the dup....

Hello Jonathan,
Thanks for your response.
I am using Java 1.8.0_201 (Java 8)
The error is generated and everything stops working; and no, it does not run the DUP into the repository
Regards,
Ade

Hello. I am trying out Essential Open Source for a Proof of Concept. I am using Windows and downloaded an installed standalone_essential_v6.7.zip and installed Protege, Essential Viewer and Essential Import Utility. Started up and was able to open the sample repository in both Protege and the Viewer...