Error when launching Schema Modeler via Relativity Server

I am playing around with the Relativity Server.
I created a new Domain and added a static user/password to the list with Security Roles set to: “*”
Then I create a new schema and try to open in schema modeler
But I am always getting the error:

I tried to login via the Administrator password and also the login of the Domain - but both don’t work.

Could you please give me advise to solve this error!?
THX a lot in advance

Could you select the ISOFT-PC node in Relativity AdminTool and send the screenshot of server info to support@ ?