Fatal error message after updating website


I have just been on my website and noticed a few things weren’t loading properly and coding was visible on the home page etc. I assumed this was to do with some of the plugins that hadn’t been updated so I wen’t through all the plugins in my admin and updated them all. I also updated to the latest WordPress. But now my site won’t load at all and i get this fatal error message:

Fatal error: Cannot redeclare sydney_set_import_files() (previously declared in /customers/0/4/b/simonfinley.net/httpd.www/wp-content/plugins/sydney-toolbox/demo-content/setup.php:18) in /customers/0/4/b/simonfinley.net/httpd.www/wp-content/themes/sydney/demo-content/setup.php on line 12
There has been a critical error on your website. Please check your site admin email inbox for instructions.

I can’t even log into the admin to try and fix it now. Can anyone offer any help in solving this issue?

many thanks


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