cargo cleanseems to fix the problem, and then if it doesn't you can try
--base-pathis set to a folder you have appropriate permissions for. Either update the permissions of your account to access
/setheum/validator(documentation default) or change
--base-pathto somewhere else (ie. your home folder).
allow use on any chain. Then go to
Settings >> Manage Website Accessin the extension and make sure that
purge-cachesubcommand is your friend. You can do a fresh sync after the purge, and things should just work.