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**Category:** Dashboard\
**Created:** [19 May 2020 09:25 UTC](https://discourse.nodered.org/t/get-xxx-1880-ui-loading-html-404-not-found-and-sidenav-left-is-not-available-did-you-use-md-component-id-left/26902 "2020-05-19T09:25:15Z")\
**Posts on this page:** 18\
**Page:** 1
**Author:**  [@TomLi](https://discourse.nodered.org/u/TomLi)\
**Post date:** [19 May 2020 09:25 UTC](https://discourse.nodered.org/t/get-xxx-1880-ui-loading-html-404-not-found-and-sidenav-left-is-not-available-did-you-use-md-component-id-left/26902/1 "2020-05-19T09:25:15Z")
when open [http://xxx:1880/ui](http://xxx:1880/ui) on Chrome browsers, there are some error in the browser debug console.
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**Author:**  [@dceejay](https://discourse.nodered.org/u/dceejay)\
**Post date:** [19 May 2020 09:32 UTC](https://discourse.nodered.org/t/get-xxx-1880-ui-loading-html-404-not-found-and-sidenav-left-is-not-available-did-you-use-md-component-id-left/26902/2 "2020-05-19T09:32:37Z")
nothing to worry about. The Loading one is there purely so end users can add their own "loading" page if required. The other is a small timing issue with angular and loading and resources being ready.
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**Author:**  [@TomLi](https://discourse.nodered.org/u/TomLi)\
**Post date:** [19 May 2020 09:40 UTC](https://discourse.nodered.org/t/get-xxx-1880-ui-loading-html-404-not-found-and-sidenav-left-is-not-available-did-you-use-md-component-id-left/26902/3 "2020-05-19T09:40:26Z")
Thanks. but Is there any way to solve it?
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**Author:**  [@TomLi](https://discourse.nodered.org/u/TomLi)\
**Post date:** [19 May 2020 09:43 UTC](https://discourse.nodered.org/t/get-xxx-1880-ui-loading-html-404-not-found-and-sidenav-left-is-not-available-did-you-use-md-component-id-left/26902/4 "2020-05-19T09:43:32Z")
about "loading" page, how to do it?
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**Author:**  [@dceejay](https://discourse.nodered.org/u/dceejay)\
**Post date:** [19 May 2020 11:47 UTC](https://discourse.nodered.org/t/get-xxx-1880-ui-loading-html-404-not-found-and-sidenav-left-is-not-available-did-you-use-md-component-id-left/26902/5 "2020-05-19T11:47:11Z")
There is nothing to solve
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**Author:**  [@dceejay](https://discourse.nodered.org/u/dceejay)\
**Post date:** [19 May 2020 11:55 UTC](https://discourse.nodered.org/t/get-xxx-1880-ui-loading-html-404-not-found-and-sidenav-left-is-not-available-did-you-use-md-component-id-left/26902/6 "2020-05-19T11:55:52Z")
If you want to add a loading page add your loading.html to the node\_modules/node-red-dashboard/dist folder
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**Author:**  [@bsense](https://discourse.nodered.org/u/bsense)\
**Post date:** [1 June 2020 08:00 UTC](https://discourse.nodered.org/t/get-xxx-1880-ui-loading-html-404-not-found-and-sidenav-left-is-not-available-did-you-use-md-component-id-left/26902/7 "2020-06-01T08:00:07Z")
Same problem here.
The issue is that if you do not add the loading.html **the ui page shows nothing**. What used to be pretty straight forward (no code, just clicking) now needs to create a file and copy to a very specific location. No big issue for seasoned people, but kinda frustrating for newbies I teach to.
May there be a workaround for this so that loading.html is not mandatory?
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**Author:**  [@dceejay](https://discourse.nodered.org/u/dceejay)\
**Post date:** [1 June 2020 08:10 UTC](https://discourse.nodered.org/t/get-xxx-1880-ui-loading-html-404-not-found-and-sidenav-left-is-not-available-did-you-use-md-component-id-left/26902/8 "2020-06-01T08:10:34Z")
It's not mandatory.
What browser/OS are you using ?
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**Author:**  [@TomLi](https://discourse.nodered.org/u/TomLi)\
**Post date:** [1 June 2020 08:16 UTC](https://discourse.nodered.org/t/get-xxx-1880-ui-loading-html-404-not-found-and-sidenav-left-is-not-available-did-you-use-md-component-id-left/26902/9 "2020-06-01T08:16:11Z")
Thanks for your reply
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**Author:**  [@TomLi](https://discourse.nodered.org/u/TomLi)\
**Post date:** [1 June 2020 08:16 UTC](https://discourse.nodered.org/t/get-xxx-1880-ui-loading-html-404-not-found-and-sidenav-left-is-not-available-did-you-use-md-component-id-left/26902/10 "2020-06-01T08:16:52Z")
chrome/win10
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**Author:**  [@bsense](https://discourse.nodered.org/u/bsense)\
**Post date:** [1 June 2020 08:16 UTC](https://discourse.nodered.org/t/get-xxx-1880-ui-loading-html-404-not-found-and-sidenav-left-is-not-available-did-you-use-md-component-id-left/26902/11 "2020-06-01T08:16:52Z")
I am in windows 10 pro with chrome 83.0.4103.61
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**Author:**  [@bsense](https://discourse.nodered.org/u/bsense)\
**Post date:** [1 June 2020 08:24 UTC](https://discourse.nodered.org/t/get-xxx-1880-ui-loading-html-404-not-found-and-sidenav-left-is-not-available-did-you-use-md-component-id-left/26902/12 "2020-06-01T08:24:20Z")
same happens with w10 pro and ms edge. This happens to node-red in rasp and win versions.
I have also tested it with a windows 2019 datacenter VM in azure with Internet Explorer and same results: /ui shows nothing, loading.html missing.
I have other instances of Nodered currently running with older versions that /ui just shows fine with same OS and same browsers
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**Author:**  [@TomLi](https://discourse.nodered.org/u/TomLi)\
**Post date:** [1 June 2020 08:28 UTC](https://discourse.nodered.org/t/get-xxx-1880-ui-loading-html-404-not-found-and-sidenav-left-is-not-available-did-you-use-md-component-id-left/26902/13 "2020-06-01T08:28:32Z")
It can be solved to add blank load.html file on node-red path
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**Author:**  [@bsense](https://discourse.nodered.org/u/bsense)\
**Post date:** [1 June 2020 08:36 UTC](https://discourse.nodered.org/t/get-xxx-1880-ui-loading-html-404-not-found-and-sidenav-left-is-not-available-did-you-use-md-component-id-left/26902/14 "2020-06-01T08:36:07Z")
if I add loading.html in .../dist now shows the spinning wheel but ui does not load themeState error persists...
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**Author:**  [@TomLi](https://discourse.nodered.org/u/TomLi)\
**Post date:** [1 June 2020 08:44 UTC](https://discourse.nodered.org/t/get-xxx-1880-ui-loading-html-404-not-found-and-sidenav-left-is-not-available-did-you-use-md-component-id-left/26902/15 "2020-06-01T08:44:43Z")
add loading.html on /node-red, but there is nothing in loading.html, I run it normally
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**Author:**  [@dceejay](https://discourse.nodered.org/u/dceejay)\
**Post date:** [1 June 2020 09:02 UTC](https://discourse.nodered.org/t/get-xxx-1880-ui-loading-html-404-not-found-and-sidenav-left-is-not-available-did-you-use-md-component-id-left/26902/16 "2020-06-01T09:02:22Z")
that error isn't to do with loading.html ?
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**Author:**  [@TomLi](https://discourse.nodered.org/u/TomLi)\
**Post date:** [1 June 2020 09:07 UTC](https://discourse.nodered.org/t/get-xxx-1880-ui-loading-html-404-not-found-and-sidenav-left-is-not-available-did-you-use-md-component-id-left/26902/17 "2020-06-01T09:07:31Z")
The error isn't to do with loading.html.
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**Author:**  [@system](https://discourse.nodered.org/u/system)\
**Post date:** [1 July 2020 09:08 UTC](https://discourse.nodered.org/t/get-xxx-1880-ui-loading-html-404-not-found-and-sidenav-left-is-not-available-did-you-use-md-component-id-left/26902/18 "2020-07-01T09:08:41Z")
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