Error rendering route: Adapters should call app.render({ url, method, headers, rawBody })

Describe the bug

Locally dev and preview works fine, it even build fine for Cloudlfare Pages. However, when attempting to access the page, the following error is displayed, with status code 500: Error rendering route: Adapters should call app.render({ url, method, headers, rawBody })

Im not sure if I was able to pinpoint where the issue lies, but when going back from next (1.0.0-next.8) to 1.0.0-next.7 would make accessing properly again.

Reproduction

I had the following svelte.config.js

import cloudflare from '@sveltejs/adapter-cloudflare';
import preprocess from 'svelte-preprocess';

export default {
	preprocess: preprocess(),
	kit: {
		target: '#svelte',
		adapter: cloudflare({
			// any esbuild options
		})
	}
};

Building for version next (1.0.0-next.8) on Cloudflare Pages and deploying it, would result in the non-functional site.

Logs

`Error rendering route: Adapters should call app.render({ url, method, headers, rawBody })`

System Info

npx: installed 1 in 2.476s

  System:
    OS: Windows 10 10.0.19042
    CPU: (8) x64 Intel(R) Core(TM) i7-4770K CPU @ 3.50GHz
    Memory: 12.00 GB / 31.94 GB
  Binaries:
    Node: 14.17.3 - C:\Program Files\nodejs\node.EXE
    Yarn: 1.22.10 - ~\AppData\Roaming\npm\yarn.CMD
  Browsers:
    Chrome: 96.0.4664.110
    Edge: Spartan (44.19041.1266.0), Chromium (97.0.1072.62)
    Internet Explorer: 11.0.19041.1202
  npmPackages:
    @sveltejs/adapter-cloudflare: 1.0.0-next.7 => 1.0.0-next.7
    @sveltejs/kit: next => 1.0.0-next.232
    svelte: ^3.44.0 => 3.46.2

Severity

serious, but I can work around it

Additional Information

No response

[CrzyMan]

I was also experiencing this error. I was able to resolve it by updating “@sveltejs/kit” to “^1.0.0-next.239”, “@sveltejs/adapter-cloudflare” to “^1.0.0-next.8”, and Node to v16.13.2

[jordanful]

I ran into the same issue deploying to Netlify and downgrading Sveltekit to "^1.0.0-next.239" fixed the issue. Thank you.