Flows stopped due to missing node types mui_tab mui_group

I had problems with my dashboard after a system crash. It is running on a RaspberryPi4 with 2GB RAM with PiOS.

So I removedNodeRed from the system:

sudo npm -g remove node-red
sudo npm -g remove node-red-admin
rm -R ~/.node-red
sudo apt-get remove nodejs

and did a clean install:

bash <(curl -sL https://raw.githubusercontent.com/node-red/linux-installers/master/deb/update-nodejs-and-nodered)

I installed the dashboard with the Manage Palette. Here is my package.json:

cat package.json
"name": "node-red-project",
"description": "initially created for you by Node-RED 1.2.6 ",
"version": "0.0.1",
"private": true,
"dependencies": {
"node-red-contrib-homeseer": "~1.0.5",
"node-red-contrib-play-audio": "^2.5.0",
"node-red-dashboard": "~2.26.1",
"node-red-node-pi-gpio": "^1.2.3",
"node-red-node-ping": "^0.2.2",
"node-red-node-random": "^0.3.0",
"node-red-node-serialport": "^0.11.1",
"node-red-node-smooth": "^0.1.2"

The only node in my flow is a debug node. If I press Deploy then I get:

Flows stopped due to missing node types

In the former installation I had the mdashboard installed, but that should be gone right?

I removed the node_modules directory and did a new install, no change in the behaviour.

Any idea where to find the solution?

I get this sometimes with unused configs. Check to see if you have any unused configuration nodes, if so delete them

Great, yes, this was the case.
After deleting the missing nodes things are working fine now.

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