The first fix I tried is this one: In wp-admin using live-link shows error - #2 by afragen
(did not work for me)
The second one is this one: Fatal error : Cannot access offset of type string on string in "class-wp-roles.php" on line 290 - #9 by surajv
This requires logging into Adminer (Local app → your site → Database tab → Open Adminer) and editing the database table wp_options, the wp_user_roles row.
For me at least Local changed my site’s values for this database entry, which generated all the errors.
Maybe you have a backup or if you don’t have a complex user role structure you can copy it from a blank site.
This is how mine looks like:
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To be honest it didn’t work 100% but it did work enough to export what I needed and start with a fresh install.
Will stop using Live Links before backing up…