Scrimba mini-browser don’t work in the next-js course, see the screenshot attached.
Also, I can’t even watch the video since it’s constantly pausing and creating a fork, up to 10 times each seconds …
This probably need a fix.
Regards
Here is the runtime console log :
dev
next dev
▲ Next.js 15.5.2
- Local: http://localhost:3000
- Network: http:// ***hidden by myself***:3000
✓ Starting…
Using cached swc package @next/swc-wasm-nodejs…
✓ Ready in 1230ms
○ Compiling / …
✓ Compiled / in 2.1s (517 modules)
⨯ [Error [InvariantError]: Invariant: Expected workUnitAsyncStorage to have a store. This is a bug in Next.js.]
⨯ [Error [InvariantError]: Invariant: Expected workUnitAsyncStorage to have a store. This is a bug in Next.js.] {
page: ‘/’
}
○ Compiling /_error …
✓ Compiled /_error in 1233ms (857 modules)
Fast Refresh had to perform a full reload due to a runtime error.
GET / 500 in 3982ms
✓ Compiled /about in 209ms (859 modules)
⨯ [Error: The default export is not a React Component in “/about/page”]
⨯ [Error: The default export is not a React Component in “/about/page”] {
page: ‘/about’
}
GET /about 500 in 472ms
I am experiencing this issue as well.
Sorry guys, our Next.js course is really playing up for some reason. This issue has been going on for a while but we’re still unsure why it appears. Does this happen after a certain point in the course or its kind of random.
No worries! It actually happens in the Build A Next.js App section. Specifically the ‘Adding a new page to our site’ challenge and the ‘File-base routing in Next.js’ challenge. After that I haven’t had any issues. The pausing and creating a scrim issue after a challenge can actually be mitigated by stopping the Runner before submitting the solution. Thanks so much for looking into it!
The whole Fullstack Path is great and I’m learning a ton!
Ah good to know about the stopping the runner. I’ve added this to the internal ticket we have for this ongoing issue along with the other information you provided.
Hopefully we can get some capacity to dive deeper into this problem as see what’s going on. Hope the rest of your learning is okay!
I have the same issue, is any solution to deal with it ?
Hey @Jose_Oscar_Reynoso, no fix for this yet unfortunately besides doing what was noted before hand as a work around.

