Can you elaborate on where you are seeing this error, and what other context surrounds it? If it appears in a log file, what details is there? If it is appearing in a UI somewhere, maybe post a screenshot.
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Did you recently create a new business adapter or change one? If so, I would delete that and see if it fixes your issue. Mine was related to a bugged business adapter.
Yes I was created some business adapters, I moved the .xml files of Business Adapters to another folder which fixed my issue, the Beacon now has started.
