DevTools failed to load SourceMap: Could not load content for http://127.0.0.1:8080/packages/build_web_compilers/src/dev_compiler_stack_trace/stack_trace_mapper.dart.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE

[liudonghua123]

Thank you for taking the time to file an issue!

This tracker is for issues related to:

• Dart core libraries ("dart:async", "dart:io", etc.)
• Dart VM
• dart2js
• dev_compiler

I followed the instructions on https://dart.dev/tutorials/web/get-started, https://dart.dev/web/debugging. And when I opened the configured chrome devtools, refresh the page. Then the console log the following warnings.

DevTools failed to load SourceMap: Could not load content for http://127.0.0.1:8080/packages/build_web_compilers/src/dev_compiler_stack_trace/stack_trace_mapper.dart.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
DevTools failed to load SourceMap: Could not load content for http://127.0.0.1:8080/packages/build_web_compilers/src/dev_compiler/dart_sdk.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE

I can set breakpoint in dart code in source panel. The debugger stopped at the breakpoint, However the types of variable can't shown.

This is the console of webdev serve.

D:\code\dart\quickstart-web>webdev serve
[INFO] Reading cached asset graph completed, took 162ms
[INFO] Checking for updates since last build completed, took 580ms
[INFO] Serving `web` on http://127.0.0.1:8080
[INFO] Running build completed, took 205ms
[INFO] Caching finalized dependency graph completed, took 118ms
[INFO] Succeeded after 328ms with 0 outputs (0 actions)
[INFO] -------------------------------------------------------------------------------------

This is the chrome devtools setttings.

[alexflav23]

+1, this is painful to the point of ridiculous.

[mahmoudsalah37]

i have same warning:
DevTools failed to load SourceMap: Could not load content for http://localhost:12205/dwds/src/injected/client.dart.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE

[kevmmdev]

i am having this issue now out of nowhere

[jadamec]

Same issue here, it would be nice to fix it soon. Thanks!

[radverg]

Same issue, just started using dart and cannot debug properly.

[DaljitKhalsa]

I am also having the same issue on my website too. I am using a plugin name LSCache which i believe is responsible for this. I am having this issue on this site https://bestandcheapbondcleaning.com.au/

If you also see the issue at your end then that mean the issue is not solved. But i will try to fix it from the cache plugin and if it will be possible to update this ticket, i will update it too.

[upkesh]

DevTools failed to load SourceMap: Could not load content for http://127.0.0.1:8080/packages/build_web_compilers/src/dev_compiler/dart_sdk.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE

Getting same issue with dart version 2.5.2

[Raynder]

Agora fudeu! todo dia vai aparecer um dizendo sobre esta falha. espero q resolvam logo!

[DaljitKhalsa]

Hi guys can someone help by telling why all of the sudden everyone is facing this error? and how to fix. As i found on all the websites i have created this error is showing. You can see i have tons of issues on my own domain https://www.khalsa-website-designers.net/ if someone knows about this latest issue and how to fix please share it with us too.

[Dagim12]

Same issue here, Swagger stuck loading.

DevTools failed to load SourceMap: Could not load content for http://localhost:5555/swagger-ui-standalone-preset.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE

[J4ckTh3R1qp3r]

Same issue

[marktanner1331]

running webdev in release mode resolved this for me. webdev serve -r

[ModelEarth]

Try removing # if it occurs after a // within a comment.
Replacing //# with // fixed for me elsewhere.

[SpringSrikanth]

DevTools failed to load SourceMap: Could not load content for http://localhost:4200/bootstrap.min.css.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE getting issue how to fix

[KhomZ]

DevTools failed to load SourceMap: Could not load content for https://unpkg.com/peerjs.min.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE

[dknavle]

Same issue, Even in the script src="https://unpkg.com/[email protected]/dist/peerjs.min.js" but it's loading file from https://unpkg.com/peerjs.min.js.map and getting 404.

[Gauravmokashi]

This worked for me

Go to inspect -> settings gear -> Uncheck 'enable javascript source maps' and 'enable css source map'.

Refresh.

[kabundege]

This worked for me

Go to inspect -> settings gear -> Uncheck 'enable javascript source maps' and 'enable css source map'.

Refresh.

could you share a screenshot (s)

[boxoffun]

could you share a screenshot (s)

[Boopalan-M]

could you share a screenshot (s)

i enabled both again i got same error

[Boopalan-M]

i enabled both again i got same error

[imreka]

This worked for me

Go to inspect -> settings gear -> Uncheck 'enable javascript source maps' and 'enable css source map'.

Refresh.

thanks. work for me 👍

[mnjayswal84]

This worked for me
Go to inspect -> settings gear -> Uncheck 'enable javascript source maps' and 'enable css source map'.
Refresh.

thanks. work for me 👍

Thanks. It works for me

[fweth]

I have this issue but I don't use the SDK.

[JimboRoxas]

DevTools failed to load SourceMap: Could not load content for http://127.0.0.1:8000/css/adminlte.css.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE

Go to inspect -> settings gear -> Uncheck 'enable javascript source maps' and 'enable css source map'.
Refresh. (I already did this but still, I have a problem do you have any update guys on how to fix this? I am using laravel and the template came from adminlte Thank you)

[2014044]

This worked for me

Go to inspect -> settings gear -> Uncheck 'enable javascript source maps' and 'enable css source map'.

Refresh.

Worked for me too, thanks.

[deal-withit]

This worked for me

Go to inspect -> settings gear -> Uncheck 'enable javascript source maps' and 'enable css source map'.

Refresh.

worked for me as well......
thanks.

[iCodeDesigns]

+1

[RaedSawanAboAlfooz]

+1

[Jay1274]

Hi guys i got 404 error code failure icons are not showing in i have paid users on my site. Please help . Link boostrap.min.css.

[hawraz93]

Delete /*# sourceMappingURL=bootstrap.min.css.map / in css/bootstrap.min.css
and delete /# sourceMappingURL=bootstrap.css.map */ in css/bootstrap.css

[temchannat]

This worked for me

Go to inspect -> settings gear -> Uncheck 'enable javascript source maps' and 'enable css source map'.

Refresh.

I have the same problem, I have tried to follow this but still doesn't work. Then I check those setting back, and it works.

[vladimir575]

89048521056

[vladimir575]

Нужна помощь

[vladimir575]

ERR_HTTP_RESPONSE_CODE_FAILURE

[vladimir575]

ERR_HTTP_RESPONSE_CODE_FAILURE

[joshualitt]

Closing this bug due to the proposed work around.

[SulemanMirz]

This worked for me

Go to inspect -> settings gear -> Uncheck 'enable javascript source maps' and 'enable css source map'.

Refresh.

I tried the same but isn't working for me.
my error is :

Uncaught (in promise) DOMException: play() failed because the user didn't interact with the document first. https://goo.gl/xX8pDD
DevTools failed to load source map: Could not load content for http://localhost:8081/debugger-ui/ui.e31bb0bc.js.map: HTTP error: status code 500, net::ERR_HTTP_RESPONSE_CODE_FAILURE

and app crashes when i try to start debugging

[avinrique]

found any way to solve that issue??

[Kfelts]

Same problem- none of the workarounds are working. I can see the files and all of the respective folders, but when I click on the file, I get an error.

[sareng002]

saya mendapatakan kesalahan DevTools failed to load source map: Could not load content for http://app-bootsrap.test/js/bootstrap.esm.js.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE
ada yang tau penyebapnya.....?

[nshahan]

I can confirm when running webdev serve some files don't look like they are being served correctly:

• http://127.0.0.1:8080/packages/build_web_compilers/src/dev_compiler_stack_trace/stack_trace_mapper.dart.js
• .dart files referenced from http://127.0.0.1:8080/packages/build_web_compilers/src/dev_compiler/dart_sdk.js.map

@annagrin I labeled this as webdev but I suppose if could be a failure of file copies into the right location during the build, not sure exactly.

[Pre1ude0]

Sorry for reopening this thread but i still cant fix this even after trying everything. I would appreciate if someone would link a fix.
Edit: FIXED THIS: was using betterdiscord and there was a faulty extension that overloaded my pc.

[casualPavel]

Seems to do the trick. Are we missing anything with those two things disabled? Yes and no. Here's an article:

What are Javascript Source Maps?

[mcheung610]

This worked for me
Go to inspect -> settings gear -> Uncheck 'enable javascript source maps' and 'enable css source map'.
Refresh.

worked for me as well...... thanks.

This worked for me as well
Go to bed -> wake up -> forget about this problem

[erikmstg]

o the poi

solved bro, thanks

[Omkareshwar14]

Worked for me as well
Thanks

[paul-n-chamberlain]

This worked for me

Go to inspect -> settings gear -> Uncheck 'enable javascript source maps' and 'enable css source map'.

Refresh.

This just gets rid of the error, but doesn't solve the issue. If you uncheck the JS and CSS source maps then you are forced to debug within the potentially minified or transpiled (if using TS) JS, which is not what you want to be doing. I feel like this might be fine for some, but for others it would be nice to have a path forward to actually be able to utilize the source maps for their intended purpose: debugging.

[mkhalifah95]

For me it was an issue with my 'sass-loader' webpack configs, basically I was setting sourceMapContents: false which caused that issue to happen, removing that option made the source map working again!