Debugging Chromecast app displays error message

Question

I have a custom Chromecast receiver that isn't working and I'm trying to figure out why. When I cast to it from Chrome on my desktop my app starts up on the Chromecast but the Chromecast dialog just says Connecting...

And although my app does start up on my TV correctly, it seems like the sender eventually times out and kills it. I receive the following error message:

chrome.cast.Error {code: "session_error", description: null, details: null}

So I decided I'd try to debug it by going to http://192.168.x.x:9222. That page loads up fine, but when I click the Remote Debugging (AppEngine) link, I get sent to a blank white page at https://chrome-devtools-frontend.appspot.com/serve_rev/......... In the Chrome dev tools I can see the following errors:


shell.js:3123 Uncaught TypeError: document.registerElement is not a function
    at Object.UI.registerCustomElement (shell.js:3123)
    at shell.js:3135
    at shell.js:3137
UI.registerCustomElement @ shell.js:3123
(anonymous) @ shell.js:3135
(anonymous) @ shell.js:3137
devtools_app.js:2 Uncaught ReferenceError: SDK is not defined
    at devtools_app.js:2
(anonymous) @ devtools_app.js:2
inspector.js:2 Uncaught ReferenceError: SDK is not defined
    at inspector.js:2

I'm using a 1st Gen Chromecast with firmware version 1.36.159268.

The error seems to be the same as described here: Unable to Open Chrome Inspector & Debug Chromecast Custom Receiver

Got the same issue on 1st gen Chromecast. Everything seems to be working fine on all other Chromecasts. It's probably worth reporting at issuetracker.google.com/issues?q=componentid:190205 . — Roy Solberg

Tormod Tormod · Accepted Answer · 2020-11-06T13:55:29

I've faced the same issue the last few days, tried Chrome 86.0.4240.183 and Chrome Canary 88.0.4317.0. Identical console log errors, both on Chromecast gen 1 and 2.

Solution: Switch to Microsoft Edge, inspecting from edge://inspect/#devices worked straight away on both my Chromecasts. Available on Windows and Mac: https://www.microsoft.com/en-us/edge.

Debugging Chromecast app displays error message

2 Answers