unhandledRejection: TypeError: Cannot read properties of null (reading 'useReducer')

[Kamadarada]

Summary

Hey guys!

i started my studies with next.js and i got this error when i'm trying to run the application.

"unhandledRejection: TypeError: Cannot read properties of null (reading 'useReducer')"
but i'm not using "useReducer" in any archive.

already tried to downgrade react

Additional information

No response

Example

No response

[Kamadarada]

Here is how i solved it:

• yarn set version stable
• yarn install
• yarn cache clean
• yarn dev

apparently it was just the yarn cache

[khokonm]

I'm using NPM, still facing the issue on newly created nextjs project, how do I solve?

[Kamadarada]

the problem was yarn cache. So try clearing npm cache

[akhilravidas]

npm install -g npm@latest
npm install
npm cache clean --force
npm run dev

[khokonm]

I tried everything, nothing worked. What finally worked was changing from page router to app router, I had to start over just for this.

…

On Sun, Jul 7, 2024 at 20:40 Felipe Kamada ***@***.***> wrote: the problem was yarn cache. So try clearing npm cache — Reply to this email directly, view it on GitHub <#61630 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AMEWMHZKN7X5WDGYNOYWRFDZLFHNXAVCNFSM6AAAAABCY63HLGVHI2DSMVQWIX3LMV43SRDJONRXK43TNFXW4Q3PNVWWK3TUHM4TSNZZG43TG> . You are receiving this because you commented.Message ID: <vercel/next. ***@***.***>