npm "MODULE_NOT_FOUND" error

[AwayGithub]

I'm trying to import Mathlib.Tactic.Ring, and I encounter this error:

`d:\Lean4\lean-4.15.0-rc1-windows\bin\lake.exe setup-file E:/Learn/LEAN/work/Main.lean Init Work Paperproof Mathlib.Data.Rat.Init Mathlib.Tactic.Linarith Mathlib.Tactic.Ring` failed:

stderr:
⚠ [5/690] Replayed BetterParser
warning: .\.\.lake/packages\Paperproof\lean\.\.\BetterParser.lean:41:3: `List.bind` has been deprecated: use `List.flatMap` instead
warning: .\.\.lake/packages\Paperproof\lean\.\.\BetterParser.lean:168:17: `List.join` has been deprecated: use `List.flatten` instead
warning: .\.\.lake/packages\Paperproof\lean\.\.\BetterParser.lean:169:54: `List.bind` has been deprecated: use `List.flatMap` instead
warning: .\.\.lake/packages\Paperproof\lean\.\.\BetterParser.lean:181:26: `List.join` has been deprecated: use `List.flatten` instead
✖ [600/690] Building proofwidgets/widgetJsAll
trace: .\.\.lake/packages\proofwidgets\widget> npm.cmd clean-install
trace: stderr:
node:internal/modules/cjs/loader:1228
  throw err;
  ^

Error: Cannot find module 'e:\Learn\LEAN\work\.lake\packages\proofwidgets\widget\node_modules\npm\bin\npm-prefix.js'
    at Module._resolveFilename (node:internal/modules/cjs/loader:1225:15)
    at Module._load (node:internal/modules/cjs/loader:1051:27)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:174:12)
    at node:internal/main/run_main_module:28:49 {
  code: 'MODULE_NOT_FOUND',
  requireStack: []
}

Node.js v20.18.0
node:internal/modules/cjs/loader:1228
  throw err;
  ^

Error: Cannot find module 'e:\Learn\LEAN\work\.lake\packages\proofwidgets\widget\node_modules\npm\bin\npm-cli.js'
    at Module._resolveFilename (node:internal/modules/cjs/loader:1225:15)
    at Module._load (node:internal/modules/cjs/loader:1051:27)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:174:12)
    at node:internal/main/run_main_module:28:49 {
  code: 'MODULE_NOT_FOUND',
  requireStack: []
}

Node.js v20.18.0
error: external command 'npm.cmd' exited with code 1
Some required builds logged failures:
- proofwidgets/widgetJsAll
error: build failed

I don't know if the problem is with my installation of the mathlib library or with Node.js. I‘d be grateful if someone offer to help!

[Vtec234]

Hi! That does look like something is wrong with your Node.js. However, if you are just using ProofWidgets4, you shouldn't need Node.js at all: see here. Can you paste your lakefile.toml or lakefile.lean?