Hello Andreas,
What versions of ctrlX CORE firmware and Node-RED are being used? At what rate are these requests being made? Are these subscription nodes being triggered more than a single time? It seems like that might be the case based on the logs. Subscriptions only need to be created a single time and it's possible the duplicate subscriptions are triggering these messages. If you are programmatticaly setting the subscription node with msg.path, make sure it is valid.
Here is the code reference on the error:
* *CtrlxProblemError: DL_INVALID_ADDRESS*: Occurs, if the path given by `msg.path` or within the node configuration is not present (e.g. misspelled).
Further error messages which come directly from the Data Layer are also possible. As an example, if the `msg.path` does not point to an existent Data Layer node, an error "*CtrlxProblemError: DL_INVALID_ADDRESS*" is emitted.
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