Dataverse Plugin

I was going to Dataverse Plugin in our journal’s OJS site, but Errors occurred during processing the Plugin form. Message showing that “Can’t connect to Dataverse.” Screenshot here:
Seeking suggestion to fix the issue.

My site uses Open Journal Systems
Dataverse version 4.6 build 62-c913662

The issue is fixed by the suggestion of Julian, Dataverse. The Root Dataverse URL will be Thank to all