mcp dev server.py Error: Cannot find module '../lib/cli.js'

[nevermet]

Dear all,

I am trying to run QuickStart but encountered this error and cannot move forward.

Could you tell me how I can resolve this error below, please?

Thanks in advance.

---

$ mcp dev server.py
node:internal/modules/cjs/loader:1146
throw err;
^

Error: Cannot find module '../lib/cli.js'
Require stack:

• /home/username/.nvm/versions/node/v20.12.2/bin/npx
  (... omitted ...) {
  code: 'MODULE_NOT_FOUND',
  requireStack: [ '/home/username/.nvm/versions/node/v20.12.2/bin/npx' ]
  }

Node.js v20.12.2
[05/22/25 00:00:00] ERROR Dev server failed

[ivanbelenky]

If you look at the error youll see that npx is not found. Maybe install it? I don't know how you manage your node versions, but all >5.2 ship with npx apparently.

Maybe this comment applies "I found that when I install node using nvm for Windows, it doesn't download npx. So just install npx globally"