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I updated my Drupal 8.6.15 > 8.7.0 After updated page not found error keep coming. (I attached photo below)

It happens only in Admin theme, when I change admin theme to default theme, errors are gone. I installed a new test site with 8.7.0. but no error has happened. I tried to change core folder, theme folder. and icon files are still in the same location. I'm really confusing now. I tried to revert older version of drupal core. when it happened errors are gone but my drupal has problem. (DB is still has information of newer version I guess..) I think path of icon is wrong. error shows me wrong location.

I guess nothing wrong with new core version. but something has happened with my previous settings which I never know. anyone can help me? enter image description here

enter image description here

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Suggestions

I see that you are new to the community, so welcome. Here are some suggestions:

  1. Make sure you performed the updates correctly (preferably using composer)
    • I see that you've already cleared cache (:
  2. See if the files are actually there in your file system.
    • If you're not getting this problem on your dev env and only getting it on your server, see if the files are getting uploaded properly.
    • I had a similar problem and the reason was because of a .gitignore entry which was ignoring the icon files, so they were not getting committed and as a result, they were not being uploaded to the server.
  3. If the SVG files exist on your server, see if you can access them by typing an absolute URL to those files
    • If not, then maybe there's something in your .htaccess or in your server config which is preventing you from seeing SVG files.

If all of the above don't work, please post a comment and I'm sure me / someone else will surely help.

  • Thank you for the comment of my question. I solved this problem last night my self – user1911959 May 7 at 2:29
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After I compared all file that already committed in git and I found nothing was wrong. And I found one of extension of my chrome called "Dark reader" could be effected to my server. I don't know the reason. Dark reader effects to localhost and one of my drupal site. when I turned off, my site works well again without any errors. I think dark reader can only be adjusted result of display but It can also make some changes to my server response or request. if someone have same problem. please check your chrome extensions as well.

  • Ok. So it wasn't a Drupal problem after all. Thanks for sharing the final solution. – Jigarius May 7 at 18:24

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