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Your flow credentials file is encrypted using a system-generated key.

If the system-generated key is lost for any reason, your credentials
file will not be recoverable, you will have to delete it and re-enter
your credentials.

You should set your own key using the 'credentialSecret' option in
your settings file. Node-RED will then re-encrypt your credentials
file using your chosen key the next time you deploy a change.
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22 Feb 20:47:25 - [warn] Encrypted credentials not found
22 Feb 20:47:25 - [info] Server now running at http://127.0.0.1:3002/
22 Feb 20:47:25 - [info] Starting flows
22 Feb 20:47:25 - [info] Started flows

22 Feb 20:47:35 - [warn] Flushing file /data/nodes to disk failed : Error: EISDIR: illegal operation on a directory, rename '/data/nodes.$$$' -> '/data/nodes'
22 Feb 20:47:35 - [warn] Error saving flows: EISDIR: illegal operation on a directory, rename '/data/nodes.$$$' -> '/data/nodes'
22 Feb 20:47:35 - [warn] Error: EISDIR: illegal operation on a directory, rename '/data/nodes.$$$' -> '/data/nodes'