Error: MiniflareCoreError [ERR_RUNTIME_FAILURE] when Starting Cloudflare Pages locally with Wrangler

[prvashisht]

To run a Cloudflare pages project locally with functions, I’m running the following command

wrangler pages dev --proxy=8080 --log-level=debug --compatibility-date=2023-09-04

My project is a [quasar]https://quasar.dev/ project that’s served on port 8080. However, I keep getting the following error in the log:

Compiling worker to "/var/folders/2h/krvh_c095nb21j_dkpb8sh1r0000gn/T/functionsWorker-0.5209931085675259.mjs"...
✨ Compiled Worker successfully
Retrieving cached values for userId from node_modules/.cache/wrangler
Metrics dispatcher: Dispatching disabled - would have sent {"type":"event","name":"build pages functions","properties":{}}.
 ⛅️ wrangler 3.9.0
------------------
wrangler dev now uses local mode by default, powered by 🔥 Miniflare and 👷 workerd.
To run an edge preview session for your Worker, use wrangler dev --remote
Metrics dispatcher: Dispatching disabled - would have sent {"type":"event","name":"run dev","properties":{"local":true,"usesTypeScript":false}}.
Using vars defined in .dev.vars
Your worker has access to the following bindings:
- Vars:
  - ENVIRONMENT: "(hidden)"
  - MAILGUN_API_KEY: "(hidden)"
  - MAILGUN_DOMAIN: "(hidden)"
  - MAILGUN_BASE_URL: "(hidden)"
  - DEFAULT_EMAIL: "(hidden)"
  - EMAIL_PRATYUSH: "(hidden)"
⎔ Starting local server...
workerd/server/server.c++:2614: info: Inspector is listening
✘ [ERROR] MiniflareCoreError [ERR_RUNTIME_FAILURE]: The Workers runtime failed to start. There is likely additional logging output above.


╭───────────────────────────────────────────────────────────────────────╮
│ [b] open a browser, [d] open Devtools, [c] clear console, [x] to exit                                                                       │
╰─────────────────────────────────────────────────────────────-─────────╯

And this server doesn’t listen to calls sent here. I’m running node version 18.17.1. Any help would be appreciated please!

Thank you

[c113]

i have the same issue, I dont know a solution though. For now, what helps it for me is to do killall workerd (on macOS) and then start it up again it usually works.

[prvashisht]

Thanks a lot! It worked

I’m getting another issue now though, every request I send via axios to my page function returns a 500 with a CORS error. I handled the options request at the top but I suspect I’m doing it wrong and will explore the solution from this question.

If you have had this issue and resolved it somehow, please let me know.

[c113]

Thanks for your answer on my other question!

No I dont have that issue, but I am also not using axios.

Are you accessing a page (function) from another domain? Otherwhise im not sure how you would get a CORS error.

Maybe your CORS header has a trailing “/” which CORS doesnt like. That was the case when i had a CORS error in the past.