DartPad shows white screen with WebAssembly errors in Chrome and Edge

[Sithila-Sihan-Somaratne]

What happened?

4 days ago, I accessed DartPad using Google Chrome, the screen was completely white.

Steps to reproduce problem

When I tried to reload again, I decided to see what was goign on using the dev tools. And I found this:

I checked the official site and ensured I’m using the latest version of Chrome:

Despite updating and restarting Chrome, the problem persists.
Here are the steps I’ve taken:

1. Tried using other browsers:
   • Firefox(version: 130.0): Works fine.
   • Microsoft Edge(version: 128.0.2739.67): Same issue, even after updating with same errors and warnings.
2. Checked Google Chrome Incognito Mode and Guest Mode: Still the same issue.

What could be the main causes? Any answers would be appreciated.

[Sithila-Sihan-Somaratne]

I also posted aquestion on StackOverflow regarding the issue: https://stackoverflow.com/questions/78948694/dartpad-shows-white-screen-with-webassembly-errors-in-chrome-and-edge

[TheLiux]

I had the same problem.
But the console output was different. Works in safari though

Device: Macbook Pro M1 16GB
Browser: Chrome 128.0.6613.138 arm64

skwasm.js:17 Aborted()
za @ skwasm.js:17Understand this error
main.dart.mjs:55 JavaScriptError
main.dart.mjs:55 at https://dartpad.dev/main.dart.wasm:wasm-function[13738]:0x2265fb
main.dart.mjs:55     at https://dartpad.dev/main.dart.wasm:wasm-function[13792]:0x2296d0
main.dart.mjs:55     at https://dartpad.dev/main.dart.wasm:wasm-function[13754]:0x2274aa
main.dart.mjs:55     at https://dartpad.dev/main.dart.wasm:wasm-function[13738]:0x2265e3
main.dart.mjs:55     at https://dartpad.dev/main.dart.wasm:wasm-function[13792]:0x2296d0
main.dart.mjs:55     at https://dartpad.dev/main.dart.wasm:wasm-function[13762]:0x227b4e
main.dart.mjs:55     at https://dartpad.dev/main.dart.wasm:wasm-function[13738]:0x2265e3
main.dart.mjs:55     at https://dartpad.dev/main.dart.wasm:wasm-function[13792]:0x2296d0
skwasm.js:17 Aborted()
za @ skwasm.js:17Understand this error
main.dart.mjs:55 Another exception was thrown: Instance of 'minified:Class1175<void>'

[foxbg]

Similar issue in Opera version: 114.0.5282.185
Failed to load resource: net::ERR_ADDRESS_INVALID dartpad.dev/:1 <meta name="apple-mobile-web-app-capable" content="yes"> is deprecated. Please include <meta name="mobile-web-app-capable" content="yes"> 2main.dart.wasm:0x253c16 Uncaught RuntimeError: illegal cast at main.dart.wasm:0x253c16 at main.dart.wasm:0x251195 at main.dart.wasm:0x2510f2 at main.dart.wasm:0x253a48 at main.dart.wasm:0x25202d at main.dart.wasm:0x253e95 at main.dart.wasm:0x25202d at main.dart.wasm:0x253e95 at main.dart.wasm:0x25202d at main.dart.wasm:0x25732d skwasm.js:14 Aborted() Oa @ skwasm.js:14 main.dart.mjs:72 JavaScriptError main.dart.mjs:72 at https://dartpad.dev/main.dart.wasm:wasm-function[2047]:0x13afb1 main.dart.mjs:72 at https://dartpad.dev/main.dart.wasm:wasm-function[2046]:0x13ae62 main.dart.mjs:72 at https://dartpad.dev/main.dart.wasm:wasm-function[2042]:0x13ad78 main.dart.mjs:72 at https://dartpad.dev/main.dart.wasm:wasm-function[2537]:0x143782 main.dart.mjs:72 at https://dartpad.dev/main.dart.wasm:wasm-function[15523]:0x27bf5c main.dart.mjs:72 at https://dartpad.dev/main.dart.wasm:wasm-function[15530]:0x27c2db main.dart.mjs:72 at https://dartpad.dev/main.dart.wasm:wasm-function[883]:0x11ce0b main.dart.mjs:72 at https://dartpad.dev/main.dart.mjs:244:81 skwasm.js:14 Aborted() Oa @ skwasm.js:14 main.dart.mjs:72 Another exception was thrown: Instance of 'minified:Class1179<void>' skwasm.js:14 Aborted() Oa @ skwasm.js:14 main.dart.mjs:72 Another exception was thrown: Instance of 'minified:Class1179<void>' skwasm.js:14 Aborted() Oa @ skwasm.js:14 main.dart.mjs:72 Another exception was thrown: Instance of 'minified:Class1179<void>' skwasm.js:14 Aborted() Oa @ skwasm.js:14 main.dart.mjs:72 Another exception was thrown: Instance of 'minified:Class1179<void>' skwasm.js:14 Aborted() Oa @ skwasm.js:14 main.dart.mjs:72 Another exception was thrown: Instance of 'minified:Class1179<void>' skwasm.js:14 Aborted() Oa @ skwasm.js:14 main.dart.mjs:72 Another exception was thrown: Instance of 'minified:Class1179<void>' skwasm.js:14 Aborted() Oa @ skwasm.js:14 25main.dart.mjs:72 Another exception was thrown: Instance of 'minified:Class1179<void>' skwasm.js:14 Aborted() Oa @ skwasm.js:14 32main.dart.mjs:72 Another exception was thrown: Instance of 'minified:Class1179<void>' main.dart.wasm:0x253b3d Uncaught RuntimeError: illegal cast at main.dart.wasm:0x253b3d at main.dart.wasm:0x251195 at main.dart.wasm:0x2510f2 at main.dart.wasm:0x253e9a at main.dart.wasm:0x25202d at main.dart.wasm:0x253e95 at main.dart.wasm:0x25202d at main.dart.wasm:0x253e95 at main.dart.wasm:0x25202d at main.dart.wasm:0x25732d
Opened BUG-1747 with Opera

[omkartapale]

Hi @Sithila-Sihan-Somaratne

I'm also facing the same issue on both Edge v131.0.2903.112 (Official build) (64-bit) and Google Chrome v131.0.6778.205 (Official Build) (64-bit) browsers with the latest version.

Also failing to browse embedded DartPad blocks on Flutter Dart API Docs

Troubleshooting DartPad also won't help.

Screenshots:

Any updates from Dart team on how to resolve or fix this?

[jake-dev-99]

This exact signature mismatch issue was driving me crazy on Arc, so I spent some time digging into and resetting every setting imaginable. Turns out, I had graphics acceleration disabled in chrome://settings/system which completely borked Dartpad. Hopefully enabling this and allowing third party cookies / redirects / popups (and all the other usual jazz) will help!

If this alone is causing issues, you can always reset your browser settings to default, enable graphics acceleration (if needed), then give it another go 💪