Error in enabling Dataverse Plugin & PLN

I have enabled dataverse plugin. However, when I am feeding in dataverse url and api token, it gives an error message “can’t connect to dataverse”. I am attaching the screenshot for the same. I tried to disable dataverse and enable dataverse again. However, enable link is not showing after I disabled dataverse.

When I tried to enable PLN plugin, nothing is happening and again in notification area it is showing “An error occured updating this submission’s data in Dataverse”, and again generic plugin page is shown without pln getting enabled.

Kindly help, I am really getting frustrated

The dataverse root URL will not include your journal’s information. See:

Thanks for your help and reply. However, we have upgraded OJS from 2.4.8 to 3.0.2. I guess they have not included this plugin yet.