Same problem here. NIFI 1.7.1 and NIFI Registry 0.2.0. I already see this exception when I don't run NIFI, but only NIFI reg. I used the docker container for the registry : https://hub.docker.com/r/apache/nifi-registry/; it messes up my NIFI Registry GUI, as the app in the browser receives 409 errors...
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