thx for your help. The console says:
openhab> bundle:list -s | grep -i openweathermap
224 x Active x 80 x 0.10.0.oh240M6 x org.eclipse.smarthome.binding.openweathermap
openhab>
So it seems as it “nearly” look like yours. (I’m on OH 2.4 M6)
owm.things:
Bridge openweathermap:weather-api:api "OpenWeatherMap Account" [apikey="my-key 1-32", refreshInterval=30, language="de"] {
Thing weather-and-forecast local "Local Weather And Forecast" [location="12.34567,8.123456,102", forecastHours=18, forecastDays=0]
}
As you told above i adjusted the locationsettings in the owm.things file as they are in my paper-ui. And now no more Warning-Message " [WARN ] [mon.registry.AbstractManagedProvider] - Could not update element with key openweathermap:weather-and-forecast:api:local in ManagedThingProvider, because it does not exists." is spit out by the logger.
I think what one can see in Paper-UI is The Bridge (OpenWeatherMap Account) and the Thing inside (Local Weather and Forecast).
At the moment both are online:

What i learned from @cweitkamp is, that the parameter “forecastDays” in Things-File has to be set to zero, although i only have a free account.
But i think there are other problems too with the Binding. When making changes (e.g. forecastHours=24) in the Things-File the following Error-Messages are logged:
2018-11-22 21:02:21.023 [INFO ] [el.core.internal.ModelRepositoryImpl] - Refreshing model 'owm.things'
2018-11-22 21:02:21.363 [ERROR] [nal.common.AbstractInvocationHandler] - An error occurred while calling method 'ThingHandler.thingUpdated()' on 'org.eclipse.smarthome.binding.openweathermap.internal.handler.OpenWeatherMapWeatherAndForecastHandler@e12e9d': Duplicate channels openweathermap:weather-and-forecast:api:local:forecastHours21#time-stamp
java.lang.IllegalArgumentException: Duplicate channels openweathermap:weather-and-forecast:api:local:forecastHours21#time-stamp
at org.eclipse.smarthome.core.thing.util.ThingHelper.ensureUniqueChannels(ThingHelper.java:159) ~[?:?]
at org.eclipse.smarthome.core.thing.util.ThingHelper.ensureUniqueChannels(ThingHelper.java:151) ~[?:?]
at org.eclipse.smarthome.core.thing.util.ThingHelper.ensureUniqueChannels(ThingHelper.java:147) ~[?:?]
at org.eclipse.smarthome.core.thing.binding.builder.ThingBuilder.withChannel(ThingBuilder.java:74) ~[?:?]
at org.eclipse.smarthome.binding.openweathermap.internal.handler.OpenWeatherMapWeatherAndForecastHandler.initialize(OpenWeatherMapWeatherAndForecastHandler.java:157) ~[?:?]
at org.eclipse.smarthome.core.thing.binding.BaseThingHandler.thingUpdated(BaseThingHandler.java:208) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:?]
at org.eclipse.smarthome.core.internal.common.AbstractInvocationHandler.invokeDirect(AbstractInvocationHandler.java:153) [101:org.eclipse.smarthome.core:0.10.0.oh240M6]
at org.eclipse.smarthome.core.internal.common.Invocation.call(Invocation.java:53) [101:org.eclipse.smarthome.core:0.10.0.oh240M6]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:?]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:?]
at java.lang.Thread.run(Thread.java:748) [?:?]
2018-11-22 21:04:23.560 [INFO ] [el.core.internal.ModelRepositoryImpl] - Refreshing model 'owm.things'
2018-11-22 21:04:23.720 [ERROR] [nal.common.AbstractInvocationHandler] - An error occurred while calling method 'ThingHandler.thingUpdated()' on 'org.eclipse.smarthome.binding.openweathermap.internal.handler.OpenWeatherMapWeatherAndForecastHandler@e12e9d': Duplicate channels openweathermap:weather-and-forecast:api:local:forecastHours24#time-stamp
java.lang.IllegalArgumentException: Duplicate channels openweathermap:weather-and-forecast:api:local:forecastHours24#time-stamp
at org.eclipse.smarthome.core.thing.util.ThingHelper.ensureUniqueChannels(ThingHelper.java:159) ~[?:?]
at org.eclipse.smarthome.core.thing.util.ThingHelper.ensureUniqueChannels(ThingHelper.java:151) ~[?:?]
at org.eclipse.smarthome.core.thing.util.ThingHelper.ensureUniqueChannels(ThingHelper.java:147) ~[?:?]
at org.eclipse.smarthome.core.thing.binding.builder.ThingBuilder.withChannel(ThingBuilder.java:74) ~[?:?]
at org.eclipse.smarthome.binding.openweathermap.internal.handler.OpenWeatherMapWeatherAndForecastHandler.initialize(OpenWeatherMapWeatherAndForecastHandler.java:157) ~[?:?]
at org.eclipse.smarthome.core.thing.binding.BaseThingHandler.thingUpdated(BaseThingHandler.java:208) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:?]
at org.eclipse.smarthome.core.internal.common.AbstractInvocationHandler.invokeDirect(AbstractInvocationHandler.java:153) [101:org.eclipse.smarthome.core:0.10.0.oh240M6]
at org.eclipse.smarthome.core.internal.common.Invocation.call(Invocation.java:53) [101:org.eclipse.smarthome.core:0.10.0.oh240M6]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:?]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:?]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:?]
at java.lang.Thread.run(Thread.java:748) [?:?]
After that the owm-Thing goes to unknown

later to “offline” and after half an hour or later it goes online again (I hope so - at the moment it’s unknown)