Can you try and delete the Hero theme directory from the /wp-content/themes directory to confirm that it is the theme giving the problem?
I can’t access any part of the admin for the page.
Use a FTP client to rename the Hero theme directory. You don’t need to access the admin to do this.
I changed themes and i’m still getting an error. the error seems to occur regardless of which theme i pick. the error is:
Warning: join() [function.join]: Invalid arguments passed in /homepages/42/d417915864/htdocs/app437469440/wp-includes/post-template.php on line 387
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Try downloading a fresh copy of WordPress and replacing all the files except the wp-content folder