Hi Alex,
Please re-check the resolution steps. I think you are missing the last point, the option is to call Explorer with an manual login:
Log in by replacing the part of the URL after http://<server>:<port>/explorer/ with
noSSO.jsp.
For example http://<server>:<port>/explorer/noSSO.jsp. The application starts without
prompting for login information.
This should work, and no error should appear.
I hope this helps,
Denis