This can happen after a migration. The issue is that something in the configuration is incorrect.
- Login via FTP
- Rename your .htaccess file to .htaccess.bak
- Delete any php.ini files
- Clear browser cache
- Reload the page.
- Login to WordPress and save permalinks (otherwise pages will show Not Found)
If this does not work you have a few more options.
- Make sure in MultiPHPManager that the site is using the latest version of ea-php and php-fpm is enabled.
- Delete the .htaccess file in wp-content and any caching files.