Solarlog binding: Http client factory not available (solved)

Hi,
since updating OH to the latest version (openHAB 3.4.0-SNAPSHOT - Build #3099), I get solarlog binding errors every minute:

2022-09-27 13:28:32.231 [WARN ] [log.internal.handler.SolarLogHandler] - Error refreshing source solarlog:meter:pv: Http client factory not available
java.lang.IllegalStateException: Http client factory not available
	at org.openhab.core.io.net.http.HttpUtil.executeUrlAndGetReponse(HttpUtil.java:191) ~[?:?]
	at org.openhab.core.io.net.http.HttpUtil.executeUrl(HttpUtil.java:155) ~[?:?]
	at org.openhab.core.io.net.http.HttpUtil.executeUrl(HttpUtil.java:130) ~[?:?]
	at org.openhab.core.io.net.http.HttpUtil.executeUrl(HttpUtil.java:108) ~[?:?]
	at org.openhab.binding.solarlog.internal.handler.SolarLogHandler.refresh(SolarLogHandler.java:103) ~[?:?]
	at org.openhab.binding.solarlog.internal.handler.SolarLogHandler.lambda$0(SolarLogHandler.java:79) ~[?:?]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515) [?:?]
	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305) [?:?]
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305) [?:?]
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [?:?]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [?:?]
	at java.lang.Thread.run(Thread.java:829) [?:?]

The item values of the solarlog get updated, but the error is annoying (filling the OH log).
Rebooting and cleaning cache did not help.
There was nothing else changed, only updated to the newest version.
Any ideas on how to remove these errors?

After some further reboots and another update, the log error is gone.