Error loading node-red

[sahsha]

I'm getting error while running node-red. I followed the forum:

Windows 10 [error] Failed to start server: [error] TypeError: Cannot read property

Hi @dougcr4 this is a rare issue that we've never managed to get to the root cause of. If you are still hitting it, could I trouble you to add a bit of debug into the code to help us figure it out? Specifically, if you edit the file C:\Users\Dell\AppData\Roaming\npm\node_modules\node-red\node_modules@node-red\registry\lib\registry.js and look at line 186 you should see: set.types.forEach(function(t) { if (nodeTypeToId.hasOwnProperty(t)) { Please add the …

Added the DEBUG line & getting the details as follows.

SyntaxError: missing ) after argument list
at Object.compileFunction (node:vm:353:18)
at wrapSafe (node:internal/modules/cjs/loader:1039:15)
at Module._compile (node:internal/modules/cjs/loader:1073:27)
at Object.Module._extensions..js (node:internal/modules/cjs/loader:1138:10)
at Module.load (node:internal/modules/cjs/loader:989:32)
at Function.Module._load (node:internal/modules/cjs/loader:829:14)
at Module.require (node:internal/modules/cjs/loader:1013:19)
at require (node:internal/modules/cjs/helpers:93:18)
at Object. (C:\Users\Sahil\AppData\Roaming\npm\node_modules\node-red\node_modules@node-red\registry\lib\index.js:27:16)
at Module._compile (node:internal/modules/cjs/loader:1109:14)

Can anyone help what should be done next?

[Steve-Mcl]

If you added the debug lines as Nick suggested...

@knolleary

Please add the following immediately before it:

                // START DEBUG
                if (!set.types) {
                    console.log("Module:",module.name);
                    console.log("Path:",module.path);
                    console.log("Set:",setName);
                }
                // END DEBUG
                set.types.forEach(function(t) {
                    if (nodeTypeToId.hasOwnProperty(t)) {

The next time you restart Node-RED you'll get a bit more information in the log about what node module its loading when it hits the error

... what was the reason for adding those?

What error were you getting that prompted you add these debug lines?

[sahsha]

Just as the post suggested to find out the node causing the error. So I can "npm remove" the node.

This was the error I was getting:

Welcome to Node-RED

16 Jun 11:54:53 - [info] Node-RED version: v1.3.5
16 Jun 11:54:53 - [info] Node.js version: v16.3.0
16 Jun 11:54:53 - [info] Windows_NT 10.0.19042 x64 LE
16 Jun 11:54:58 - [info] Loading palette nodes
16 Jun 11:55:05 - [error] Failed to start server:
16 Jun 11:55:05 - [error] TypeError: Cannot read property 'forEach' of undefined
at Object.addModule (C:\Users\Sahil\AppData\Roaming\npm\node_modules\node-red\node_modules@node-red\registry\lib\registry.js:195:27)
at C:\Users\Sahil\AppData\Roaming\npm\node_modules\node-red\node_modules@node-red\registry\lib\loader.js:153:34

[Steve-Mcl]

ok, I get that, however the original error on that post is TypeError: Cannot read property 'forEach' of undefined

You are getting SyntaxError: missing ) after argument list

This suggests you have a different problem OR you have made a mistake when adding the debug lines.

so I will ask again, what error were you getting (originally) before you added these debug lines?

[Steve-Mcl]

I see you edited your post while I was typing.

Ok, so you have possibly made a mistake when adding the debug lines causing the error SyntaxError: missing ) after argument list.

Show us a few lines before and a few lines after where you added the debug code.

[sahsha]

Before adding the debug line this was shown:

[zenofmud]

Try putting a catch node connected to a debug node (set to display the complete msg object) in the flow and see if it shows anything.

[sahsha]

I panicked and got caught up in a cycle of re-installing node.js & even downgraded to previous build of windows 10.

Thought it over again and gave a another try & deleted the last node I added "ui-etable" manually from location
C:\Users\user-name\ .node-red\node_modules
It seems to be working now.

[Steve-Mcl]

@sahsha

re-installing node.js

Overkill

@sahsha

downgraded to previous build of windows 10.

Extreme overkill.

---

The worst you would need to do is delete node modules / clear npm cache OR downgrade node js to LTS version.

[sahsha]

"node-red-node-ui-etable" appeared again

and so node-red has stopped again

when I delete the folder it works for some while then it re-appears and sever disconnects.
Have I done something wrong which is causing this?

[Steve-Mcl]

it is probably in package.json

• open a command prompt & uninstall it property...

  cd c:\users\Sahil\.node-red
  npm uninstall node-red-node-ui-etable
  

• check folder is gone from c:\users\Sahil\.node-red\node_modules

• restart node-red

[sahsha]

Flows have started but also showing the below warning

(node:5628) [DEP0128] DeprecationWarning: Invalid 'main' field in 'C:\Users\Sahil.node-red\node_modules\node-red-dashboard\package.json' of 'none'. Please either fix that or report it to the module author

[Steve-Mcl]

I suspect you are using node-js v16 - this is noted & it is only a waring - your problem is fixed.

[sahsha]

Yes, I'm using node-v16.3.0. Thankyou.