Turbopack Error: Failed to write app endpoint /page

[Facundo-Martin]

Turbopack version: 142b08bf
Next.js version: 0.0.0

Error message:

Turbopack Error: Failed to write app endpoint /page

Bug Description

Starting a Next.js sandbox with the E2B Sandbox SDK as listed in https://e2b.dev/docs/template/examples/nextjs

// template.ts
import { Template, waitForURL } from 'e2b'

export const template = Template()
  .fromBunImage('1.3')
  .setWorkdir('/home/user/nextjs-app')
  .runCmd(
    'bun create next-app --app --ts --tailwind --turbopack --yes --use-bun .'
  )
  .runCmd('bunx --bun shadcn@latest init -d')
  .runCmd('bunx --bun shadcn@latest add --all')
  .runCmd(
    'mv /home/user/nextjs-app/* /home/user/ && rm -rf /home/user/nextjs-app'
  )
  .setWorkdir('/home/user')
  .setStartCmd('bun --bun run dev --turbo', waitForURL('http://localhost:3000'))

// build.ts
import { Template, defaultBuildLogger } from 'e2b'
import { template as nextJSTemplate } from './template'

Template.build(nextJSTemplate, {
  alias: 'nextjs-app-bun',
  cpuCount: 4,
  memoryMB: 4096,
  onBuildLogs: defaultBuildLogger(),
})

When running the build script with npx tsx build.dev.ts the template builds correctly.

However, when finalizing the template build and making a curl request (Waiting for template to be ready: curl -s -o /dev/null -w "%{http_code}" http://localhost:3000 | grep -q "200") , the app gets started, shows ready status, starts compiling, and after a while it starts throwing the following error:

47.0s | 11:58:27 AM INFO  [start] [stderr]: FATAL: An unexpected Turbopack error occurred. A panic log has been written to /tmp/next-panic-920717285f775a8a2c83513d1f89a6e3.log.
47.0s | 11:58:27 AM INFO  [start] [stderr]: To help make Turbopack better, report this error by clicking here: https://github.com/vercel/next.js/discussions/new?category=turbopack-error-report&title=Turbopack%20Error%3A%20Failed%20to%20write%20app%20endpoint%20%2Fpage&body=Turbopack%20version%3A%20%60142b08bf%60%0ANext.js%20version%3A%20%600.0.0%60%0A%0AError%20message%3A%0A%60%60%60%0ATurbopack%20Error%3A%20Failed%20to%20write%20app%20endpoint%20%2Fpage%0A%60%60%60&labels=Turbopack,Turbopack%20Panic%20Backtrace
47.0s | 11:58:27 AM INFO  [start] [stderr]: -----
50.5s | 11:58:31 AM INFO  [start] [stdout]: GET / 500 in 17.5s (compile: 16.7s, render: 837ms)
52.4s | 11:58:33 AM INFO  [start] [stderr]: -----
52.4s | 11:58:33 AM INFO  [start] [stderr]: FATAL: An unexpected Turbopack error occurred. A panic log has been written to /tmp/next-panic-920717285f775a8a2c83513d1f89a6e3.log.
52.4s | 11:58:33 AM INFO  [start] [stderr]: To help make Turbopack better, report this error by clicking here: https://github.com/vercel/next.js/discussions/new?category=turbopack-error-report&title=Turbopack%20Error%3A%20Failed%20to%20write%20app%20endpoint%20%2Fpage&body=Turbopack%20version%3A%20%60142b08bf%60%0ANext.js%20version%3A%20%600.0.0%60%0A%0AError%20message%3A%0A%60%60%60%0ATurbopack%20Error%3A%20Failed%20to%20write%20app%20endpoint%20%2Fpage%0A%60%60%60&labels=Turbopack,Turbopack%20Panic%20Backtrace
52.4s | 11:58:33 AM INFO  [start] [stderr]: -----
52.4s | 11:58:33 AM INFO  [start] [stdout]: GET / 500 in 63ms (compile: 10ms, render: 54ms)
54.8s | 11:58:35 AM INFO  [start] [stderr]: -----
54.8s | 11:58:35 AM INFO  [start] [stderr]: FATAL: An unexpected Turbopack error occurred. A panic log has been written to /tmp/next-panic-920717285f775a8a2c83513d1f89a6e3.log.
54.8s | 11:58:35 AM INFO  [start] [stderr]: To help make Turbopack better, report this error by clicking here: https://github.com/vercel/next.js/discussions/new?category=turbopack-error-report&title=Turbopack%20Error%3A%20Failed%20to%20write%20app%20endpoint%20%2Fpage&body=Turbopack%20version%3A%20%60142b08bf%60%0ANext.js%20version%3A%20%600.0.0%60%0A%0AError%20message%3A%0A%60%60%60%0ATurbopack%20Error%3A%20Failed%20to%20write%20app%20endpoint%20%2Fpage%0A%60%60%60&labels=Turbopack,Turbopack%20Panic%20Backtrace

I've also tried running it with webpack instead of turbopack, but haven't had any success with it (stalls at "Compiling /" step):

// template.ts
import { Template, waitForURL } from "e2b";

export const template = Template()
  .fromBunImage("1.3")
  .setWorkdir("/home/user/nextjs-app")
  .runCmd(
    "bun create next-app  . --app --ts --tailwind --yes --no-turbopack --webpack --use-bun ",
  )
  .runCmd("bunx --bun shadcn@latest init -d")
  .runCmd("bunx --bun shadcn@latest add --all")
  .runCmd(
    "mv /home/user/nextjs-app/* /home/user/ && rm -rf /home/user/nextjs-app",
  )
  .setWorkdir("/home/user")
  .setStartCmd("bun --bun run dev", waitForURL("http://localhost:3000"));

12.7s | 12:14:59 PM INFO  Waiting for template to be ready: curl -s -o /dev/null -w "%{http_code}" http://localhost:3000 | grep -q "200"
12.7s | 12:14:59 PM INFO  [start] [stderr]: $ next dev --webpack
20.6s | 12:15:07 PM INFO  [start] [stdout]: ▲ Next.js 16.0.1 (webpack)
20.6s | 12:15:07 PM INFO  [start] [stdout]: - Local:        http://localhost:3000
20.6s | 12:15:07 PM INFO  [start] [stdout]: - Network:      http://169.254.0.21:3000
20.6s | 12:15:07 PM INFO  [start] [stdout]: ✓ Starting...
20.9s | 12:15:07 PM INFO  [start] [stdout]: Attention: Next.js now collects completely anonymous telemetry regarding usage.
20.9s | 12:15:07 PM INFO  [start] [stdout]: This information is used to shape Next.js' roadmap and prioritize features.
20.9s | 12:15:07 PM INFO  [start] [stdout]: You can learn more, including how to opt-out if you'd not like to participate in this anonymous program, by visiting the following URL:
20.9s | 12:15:07 PM INFO  [start] [stdout]: https://nextjs.org/telemetry
22.9s | 12:15:09 PM INFO  [start] [stdout]: ✓ Ready in 7.1s
27.2s | 12:15:13 PM INFO  [start] [stdout]: ○ Compiling / ...
⡿ Building 300.6s