I’ve just upgraded too and have the same problem.
Accessing plugins is ok, Its just the pages – they can not be viewed for editing.
lisa
(@contentiskey)
nathang828-
suggestions
1-install health check plugin which can be used in troubleshooting mode to deactivate all plugins and theme
might help narrow down the source of the issue
https://ww.wp.xz.cn/plugins/health-check/
2-try classic editor plugin
https://ww.wp.xz.cn/plugins/classic-editor/
3-make a backup of your database and files
cathcoombs-
best to start a new topic since your site might not be set up with exact same configuration as original post
Having the same issue. Can’t edit or create pages, tried disabling all plugins, changed the theme and tried and wordpress 5.0.2
Getting this error: api-fetch.min.js?ver=2.2.6:1 POST https://site.com/wp-json/wp/v2/pages/27/autosaves?_locale=user 401 (Unauthorized)
Only solution is to use classic editor.
Can we just keep the current wordpress version
Hi All.
Did you get an error when you attempted the upgrade?
I did.
I found this post by a moderator and it resolved my problem:
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Otto (@otto42)
ww.wp.xz.cn Admin
8 hours, 2 minutes ago
Okay, what you’re seeing in those images looks like an incomplete upgrade. You need to do a manual upgrade of the files.
https://codex.ww.wp.xz.cn/Upgrading_WordPress#Manual_Update
Basically, download a fresh copy of 5.0.3. Replace the wp-admin and wp-includes directories with copies from the ZIP file. Also replace the core root files like wp-settings.php and wp-login.php and so on (not the wp-config.php file, you keep that one as it is).
Once you have replaced all the files, your site should be working again.
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I hope you are all able to resove your problems.
@cathcoombs unfortunately replacing wp-admin, wp-includes and all the files except wp-config.php did not fix the issue in my case.
It’s a new website and worked well on 5.0.2 (it was build on 5.0.2) but then it automatically updated to 5.0.3 and the issue started.
Only solution is to use Classic Editor.