Why my NodeRED flows are disappear after Droplet Migration Schedule

I have NodeRED deploy in my droplet. It was work well until the migration schedule in Singapore Region on 2017-02-10 22:00 UTC (They move my droplet to new physical machine). My flows are all disappear from NodeRED 's editor. I try to restart NodeRED here is a message. Please anyone give me some advise, thank you.

Welcome to Node-RED
12 Feb 07:58:30 - [info] Node-RED version: v0.15.1
12 Feb 07:58:30 - [info] Node.js  version: v4.2.6
12 Feb 07:58:30 - [info] Linux 4.4.0-45-generic x64 LE
12 Feb 07:58:31 - [info] Loading palette nodes
12 Feb 07:58:32 - [info] UI started at /ui
12 Feb 07:58:33 - [warn] ------------------------------------------------------
12 Feb 07:58:33 - [warn] [rpi-gpio] Info : Ignoring Raspberry Pi specific node
12 Feb 07:58:33 - [warn] ------------------------------------------------------
12 Feb 07:58:33 - [info] Settings file  : /home/charnon/.node-red/settings.js
12 Feb 07:58:33 - [info] User directory : /home/charnon/.node-red
12 Feb 07:58:33 - [info] Flows file     : /home/charnon/.node-red/flows_FeelingW                                                                                        att.json
12 Feb 07:58:33 - [warn] Communication server error: Error: listen EACCES 0.0.0.                                                                                        0:80
12 Feb 07:58:33 - [error] Uncaught Exception:
12 Feb 07:58:33 - [error] Error: listen EACCES
    at Object.exports._errnoException (util.js:870:11)
    at exports._exceptionWithHostPort (util.js:893:20)
    at Server._listen2 (net.js:1224:19)
    at listen (net.js:1273:10)
    at net.js:1382:9
    at nextTickCallbackWith3Args (node.js:452:9)
    at process._tickCallback (node.js:358:17)

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