Broken installer setup

I installed RHPAM 7.0.ER3 and ER4 on EAP 7.1, customizing KIE server with the default settings (default-kieserver name, etc.),

Afterwards, started the platform and opened Process Definitions / Task Inbox where I get the exceptions such as:

"The task list could not be loaded. Check if the jBPM Capabilities are enabled and if the remote server is correctly set up."

In the server.log I see:

Unexpected HTTP response code when requesting URI 'http://localhost:8080/kie-server/services/rest/server//queries/definitions/jbpmHumanTasksWithAdmin/filtered-data?mapper=RawList&page=0&pageSize=10'! Error code: 404, message

The errors are similar for Process Definitions, instances, execution errors, tasks, etc.