The Breadcrumbs plugin causes this error, so try to delete it from your server so we can troubleshoot.
On which version of WordPress and this plugin are you?
Hi Melanie
I’m not sure how to delete this plugin – (you did it last time with the details I gave you) can you tell me the steps I need to take to do this? thanks, Nick
if you log in to your server via an FTP software like Filezilla (free) and navigate to your wordpress installation > wp-content > plugins you can remove the plugin folder.