cast_sender.js error: Failed to load resource: net::ERR_FAILED in Chrome

185
votes

I recently started receiving the following console errors, without any code changes taking place.

I did not install any extensions recently.

Failed to load resource: net::ERR_FAILED chrome-extension://enhhojjnijigcajfphajepfemndkmdlo/cast_sender.js
Failed to load resource: net::ERR_FAILED chrome-extension://hfaagokkkhdbgiakmmlclaapfelnkoah/cast_sender.js
Failed to load resource: net::ERR_FAILED chrome-extension://enhhojjnijigcajfphajepfemndkmdlo/cast_sender.js
Failed to load resource: net::ERR_FAILED chrome-extension://fmfcbgogabcbclcofgocippekhfcmgfj/cast_sender.js
Failed to load resource: net::ERR_FAILED

I have several YouTube player embeds on the page that are triggering this error, but they are simple:

<iframe width="100%" height="100%" src="http://www.youtube.com/embed/OUR_YOUTUBE_ID?showinfo=0&amp;wmode=transparent" frameborder="0" allowfullscreen=""></iframe>

Has anybody else experienced this?

6
javascriptyoutube
I'm hitting this too. Is it causing your JS not to run on the page? – davko
Infrequently, yes. I was able to replicate it a few times where it would break JS on the page, but most times I just see the console errors. – Alex
Is the embedded video still loading for you? It's not for me, which is bad. – kleinfreund
amazingly, google adwords support is blocking sites that have this issue. highly frustrating. – Martin Alderson
Try disabling Adblocker extension for the site. Worked for me. – Robot Boy

6 Answers

141
votes

Apparently YouTube constantly polls for Google Cast scripts even if the extension isn't installed.

From one commenter:

... it appears that Chrome attempts to get cast_sender.js on pages that have YouTube content. I'm guessing when Chrome sees media that it can stream it attempts to access the Chromecast extension. When the extension isn't present, the error is thrown.

Read more

The only solution I've come across is to install the Google Cast extension, whether you need it or not. You may then hide the toolbar button.

For more information and updates, see this SO question. Here's the official issue.

41
votes

I'm going to add to the answer given before.

It's not a bug in your code or the browser's code. It's the JavaScript code inside the YouTube iframe polls for the extensions it could interoperate with in case they were installed (likely to determine if the extension is installed).

Look at the source of www-embed-player.js (loaded from s.ytimg.com, it's YouTube static files CDN). You'll find the following:

function Wj(a){return"chrome-extension://"+a+"/cast_sender.js"}
22
votes

To stop seeing those cast_sender.js errors, edit the youtube link in the iframe src and change embed to v

2
votes

The error is try to fix a Youtube error.

The solution to avoid your Javascript-Console-Error complex is to accept that Youtube (and also other webpages) can have Javascript errors that you can't fix.

That is all.

0
votes

A simple fix for this is to install the Google Cast extension. If you don't have a Chromecast, or don't want to use the extension, no problem; just don't use the extension.

0
votes

In addition to what was already said - in order to avoid this error from interfering (stopping) other Javascript code on your page, you could try forcing the YouTube iframe to load last - after all other Javascript code is loaded.