Developer Tools API Explorer

Setup, Configuration and Use Beginners
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1

I am trying to use the API Explorer within the UI of openHAB. When I click on it (Developer tools → API Explorer) I get an empty window.
I checked the log and found:

2024-04-01 17:16:47.492 [ERROR] [.io.rest.auth.internal.TokenResource] - Error while authenticating
java.lang.NullPointerException: Cannot invoke “org.openhab.core.auth.UserSession.getRefreshToken()” because “s” is null

I searched the web, but I could not find anything related.
Running openHab 4.1.2 on Windows 11

2

Restart OH and clear the cache on your browser and if the problem persists please file an issue on the openhab-webuis repo.

3

Just submitted a ticket, clearing cache did not help