NodeRed not starting anymore

Hallo dear fellow Home Assistant users.

Since this morning I encountered my first problem that i seem not able to solve. Somehow NodeRed does not want to start anymore. It keeps tryingand trying but alwas the same result.
I haven’t got any idea what could be te problem. Maybe one of you can give me a hint?

hassio-addon-node-red@ start /opt
node $NODE_OPTIONS node_modules/node-red/red.js “–settings” “/etc/node-red/config.js”
27 Jan 13:28:48 - [info]
Welcome to Node-RED
===================
27 Jan 13:28:48 - [info] Node-RED version: v0.19.5
27 Jan 13:28:48 - [info] Node.js version: v8.14.0
27 Jan 13:28:48 - [info] Linux 4.14.81-v7 arm LE
27 Jan 13:28:50 - [info] Loading palette nodes
27 Jan 13:28:56 - [info] Dashboard version 2.13.0 started at /ui
27 Jan 13:28:57 - [info] Settings file : /etc/node-red/config.js
27 Jan 13:28:57 - [info] Context store : ‘default’ [module=memory]
27 Jan 13:28:57 - [info] User directory : /config/node-red/
27 Jan 13:28:57 - [warn] Projects disabled : editorTheme.projects.enabled=false
27 Jan 13:28:57 - [info] Flows file : /config/node-red/flows.json
27 Jan 13:28:58 - [info] Server now running at https://127.0.0.1:1880/
27 Jan 13:28:58 - [info] Starting flows
27 Jan 13:28:58 - [info] Started flows
27 Jan 13:28:58 - [red] Uncaught Exception:
27 Jan 13:28:58 - Error: bind EADDRINUSE 0.0.0.0:1900
at _handle.lookup (dgram.js:266:18)
at _combinedTickCallback (internal/process/next_tick.js:142:11)
at process._tickCallback (internal/process/next_tick.js:181:9)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! hassio-addon-node-red@ start: node $NODE_OPTIONS node_modules/node-red/red.js "--settings" "/etc/node-red/config.js"
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the hassio-addon-node-red@ start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! /root/.npm/_logs/2019-01-27T12_28_58_931Z-debug.log