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If I try and edit a post from my wp-admin dashboard, I get a “Page Not Found” error.I have tried many different things and I can’t access any of the dashboard options. I would like to reset the permalinks but again I get a page not found message. I can access the Plugin page but I have deactivated all the plugins and still the same thing. Any help is appreciated.
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Delete the root .htaccess file and try again.
You could try downloading latest WordPress and overwrite the entire /wp-admin folder. Could be missing a file.
Make a backup first.