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/t…

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!

Thanks for reporting this. We’re investigating similar reports now

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

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

hey guys! I’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 ‘/var/task/node_modules/@mjackson/node-fetch-server…

React Router app deploys successfully but returns 500 error on access

Help

gregoryzeng (Gregoryzeng) October 29, 2025, 3:58pm 10

It’s working now. Thanks for the quick support!

1 Like

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React Router app deploys successfully but returns 500 error on access

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