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what platform and os? i.e RPI running stretch or macOS v 10.13.6?
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what version of NR, node.js? (get from log at startup)?
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what is the exact error and where do you see it?
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what else is in the flow? (an image of the flow is ok, a copy of the flow is better but read this thread before you post it: How to share code or flow json)