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Here is a link that fixed the issue for me - https://lotusszoftverek.blogspot.com/2021/01/failed-to-login-clfrj0010e-notes.html
cos of this error , we have to re think about HCL domino, we have 1000 users every day going through this pain, after version 10 , notes is no more the same software it used to be
too many bugs and HCL you need to rethink
as "Guest" comments "Funny enough though: when starting the Client first and then the Designer, everything works fine." => This is the case for me, too.
Additionally, sometimes, when the Notes client is opened, the Designer refuses to launch, with no error message.
https://www-01.ibm.com/support/docview.wss?uid=swg21386597 still not fixed...
http://www-10.lotus.com/ldd/nd8forum.nsf/7756aedc25e6d81285256324005ac76c/3b377da3f857680a852574190045c7a0?OpenDocument still not fixed
Funny enough though: when starting the Client first and then the Designer, everything works fine.
Have you raised a support ticket to investigate whats causing this error for your workstation?