Hi,
i could not start my node-red server again. Getting the following error. Using node-red on windows. Hopefully anybody can help me. Is there a list or something where i can disable additional installed nodes ? Where are my flows saved? Maybe i can remove them to get the server starting again.
[info] Loading palette nodes
2 May 17:47:15 - [error] Failed to start server:
2 May 17:47:15 - [error] TypeError: Cannot read properties of undefined (reading 'forEach')
at Object.addModule (C:\Users\steve\AppData\Roaming\npm\node_modules\node-red\node_modules@node-red\registry\lib\registry.js:195:27)
at C:\Users\steve\AppData\Roaming\npm\node_modules\node-red\node_modules@node-red\registry\lib\loader.js:153:34
Welcome the forums @steve1.
This is your first post.
So when you say: i could not start my node-red server again
What do you mean "again" ? can you give us (a lot) more info, on what you have done leading upto this error?
- How are you starting Node RED
- Did you install any nodes before this error occurred
- Node Version
- Node RED version
Also, this
C:\Users\steve\AppData\Roaming\npm\node_modules\node-red\node_modules@node-red\registry\lib\loader.js
seems incorrect, it should be (node_modules\@node-red, not node_modules@node-red), but then I dont use windows so maybe normal 
C:\Users\steve\AppData\Roaming\npm\node_modules\node-red\node_modules\@node-red\registry\lib\loader.js
if you can detail your setup, it may help us to understand what is going on.
I'm starting the server using the 'cmd'. Node-red was running for few weeks, today i worked on it, added also a new node (not sure how it was named, something with table ui or so) and got an error ..."is already installed" or similar, but was not. I went on to work on an other issue. By using 'deploy' the connection to the server was lost, i tried to restart it, but only got the error.
[info] Node-RED version: v3.0.2
2 May 17:47:13 - [info] Node.js version: v18.10.0
2 May 17:47:13 - [info] Windows_NT 10.0.19044 x64 LE
2 May 17:47:15 - [info] Loading palette nodes
2 May 17:47:15 - [error] Failed to start server:
2 May 17:47:15 - [error] TypeError: Cannot read properties of undefined (reading 'forEach')
at Object.addModule (C:\Users\steve\AppData\Roaming\npm\node_modules\node-red\node_modules@node-red\registry\lib\registry.js:195:27)
at C:\Users\steve\AppData\Roaming\npm\node_modules\node-red\node_modules@node-red\registry\lib\loader.js:153:34
It's 'C:\Users\steve\AppData\Roaming\npm\node_modules\node-red\node_modules''@node-red\registry\lib\loader.js' on some reason after posting it's removing the '' from the post...
Node-red was running for a few weeks. Today, I was working on it. I also installed new node, not sure if it was 'table ui' or something. I got an error similar to 'already installed' but wasn't. Ignored it and was working on an other issue. Lateron that day, server lost connection after 'deploy'. So I want to restart (using 'cmd'), but only got this error.
<2 May 17:47:13 - [info] Node-RED version: v3.0.2
2 May 17:47:13 - [info] Node.js version: v18.10.0
2 May 17:47:13 - [info] Windows_NT 10.0.19044 x64 LE
2 May 17:47:15 - [info] Loading palette nodes
2 May 17:47:15 - [error] Failed to start server:
2 May 17:47:15 - [error] TypeError: Cannot read properties of undefined (reading 'forEach')
at Object.addModule (C:\Users\steve\AppData\Roaming\npm\node_modules\node-red\node_modules@node-red\registry\lib\registry.js:195:27)
at C:\Users\steve\AppData\Roaming\npm\node_modules\node-red\node_modules@node-red\registry\lib\loader.js:153:34 />
I'm not a core developer for Node RED - They are around of course, so I can only advise,
"what I would do"
Re-install Node RED
npm install -g --unsafe-perm node-red
(or however you installed initially)
This won't remove any nodes you have, but back them up just in case, and re-install nodes that are missing via the palette menu.
I have never really seen an error of this nature
Thx, tried the re-installed. Did not work, same error. 
what happens if you run Node RED with the argument --safe
it could well be a node that is causing issues
same error
does this directory actually exist?
or does it exist as
C:\Users\steve\AppData\Roaming\npm\node_modules\node-red\node_modules\@node-red
This is correct, when c&p error msg into browser and posting it, the '' is removed. So this should not be the problem.
What does....
C:\Users\steve\AppData\Roaming\npm\package.json contain.
also do npm list -g - what does that show
EDIT:
I should state, my knowledge is being stretched at this point (Mainly, with Windows) 
used a debug insertion I currently found in the forum. Got the following error msg:
May 19:42:59 - [info] Node-RED version: v3.0.2
2 May 19:42:59 - [info] Node.js version: v18.10.0
2 May 19:42:59 - [info] Windows_NT 10.0.19044 x64 LE
2 May 19:43:01 - [info] Loading palette nodes
Module: node-red-contrib-tabletojson
Path: \Users\steve.node-red\node_modules\node-red-contrib-tabletojson
Set: version
2 May 19:43:01 - [error] Failed to start server:
2 May 19:43:01 - [error] TypeError: Cannot read properties of undefined (reading 'forEach')
at Object.addModule (C:\Users\steve\AppData\Roaming\npm\node_modules\node-red\node_modules@node-red\registry\lib\registry.js:202:27)
at C:\Users\steve\AppData\Roaming\npm\node_modules\node-red\node_modules@node-red\registry\lib\loader.js:153:34
So maybe 'tabletojson' is not working. I'm trying to uninstall...
Edit: used: npm uninstall node-red-contrib-tabletojson
Got same error after starting the server...
What does
C:\Users\steve\AppData\Roaming\npm\package.json contain?
package.json is not in that folder, but consists:
{
"name": "node-red",
"version": "3.0.2",
"description": "Low-code programming for event-driven applications",
"homepage": "http://nodered.org",
"license": "Apache-2.0",
"repository": {
"type": "git",
"url": "GitHub - node-red/node-red: Low-code programming for event-driven applications"
},
"main": "lib/red.js",
"scripts": {
"start": "node red.js"
},
"bin": {
"node-red": "./red.js",
"node-red-pi": "bin/node-red-pi"
},
"contributors": [
{
"name": "Nick O'Leary"
},
{
"name": "Dave Conway-Jones"
}
],
"keywords": [
"editor",
"messaging",
"iot",
"flow"
],
"dependencies": {
"@node-red/editor-api": "3.0.2",
"@node-red/runtime": "3.0.2",
"@node-red/util": "3.0.2",
"@node-red/nodes": "3.0.2",
"basic-auth": "2.0.1",
"bcryptjs": "2.4.3",
"express": "4.18.1",
"fs-extra": "10.1.0",
"node-red-admin": "^3.0.0",
"nopt": "5.0.0",
"semver": "7.3.7"
},
"optionalDependencies": {
"bcrypt": "5.0.1"
},
"engines": {
"node": ">=14"
}
}
This looks maybe like 'default' from re-install?!
Short of removing Node RED entirely (and its components), and reinstalling fresh, I'm a little out of ideas.
Your flows should remain if doing this.
OR
What for someone more close to the core, to chip in
Is there an easy way to remove it completly by using command line?
Not being a Windows user:
npm uninstall [-g] node-red -g if you installed globally
then check
C:\Users\steve\AppData\Roaming\npm\node_modules\node-red
is gone
Uninstalled. Folder was gone. Reinstalled, same problem... Is there any other folder where data could be left over?
Ok, go here.
C:\Users\Steve\.node-red
and do npm list <- what's the output.
```
here
```
This was a good hint...
C:\Users\steve.node-red>npm list
node-red-project@0.0.1 C:\Users\steve.node-red
+-- node-red-contrib-iiot-opcua@4.0.11
+-- node-red-contrib-opcua@0.2.289
+-- node-red-contrib-tabletojson@1.0.3
+-- node-red-mysql-r2@1.3.0
`-- node-red-node-ui-table@0.4.3
Found another package.js in which the mayby faulty 'tabletojson' is in:
{
"name": "node-red-project",
"description": "A Node-RED Project",
"version": "0.0.1",
"private": true,
"dependencies": {
"node-red-contrib-iiot-opcua": "~4.0.11",
"node-red-contrib-opcua": "~0.2.289",
"node-red-contrib-tabletojson": "~1.0.3",
"node-red-mysql-r2": "~1.3.0",
"node-red-node-ui-table": "~0.4.3"
}
}
Can i just remove it from here?
