React Router app deploys successfully but returns 500 error on access

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1

Hi team,
My React Router project recently deploys successfully on Vercel, but the deployed site shows a 500 error when accessed:

500: INTERNAL_SERVER_ERROR
Code: FUNCTION_INVOCATION_FAILED
ID: iad1::9mzx2-1761741964954-b9ba1575dd91

The server logs display this message:

Cannot find module '/var/task/node_modules/@mjackson/node-fetch-server/dist/node-fetch-server.cjs'
Did you forget to add it to "dependencies" in `package.json`?
Node.js process exited with exit status: 1. The logs above can help with debugging the issue.

However, this error occurs even though I havenā€™t changed anything related to dependencies. The latest code runs normally in my local machine.

To verify, I reproduced the issue using the official React Router boilerplate template and can see the same ā€œcannot find moduleā€ error in the logs.
Code: React Router Boilerplate
Deployed: https://test-rr-one.vercel.app/

1 Like
4

Hi team,

Thanks for reporting this error @gregoryzeng!
We experience the same issue, yesterday the very same builds were working perfectly and today we have this error as well!

5

Thanks for reporting this. Weā€™re investigating similar reports now

7

We are having the same exact issue.
Is there any updates?

8

@gregoryzeng @minimarcel @team-9091 We just shipped a fix. Can you redeploy and let me know whether or not it works for you now?

9

It works for us! Thanks!

1 Like
10

Itā€™s working now. Thanks for the quick support!

1 Like
11

hey guys! Iā€™m still getting this issue when deploying using the vercel cli, just updated using npm i -g vercel@latest but still getting the same issue where the build and deployment succeeds but any request results in a 500 with: Cannot find module ā€˜/var/task/node_modules/@mjackson/node-fetch-server/dist/node-fetch-server.cjsā€™