Did you deactivate WP? The site expects those files to be there. Maybe you were in the middle of updating WooCommerce? I’ve experienced sometimes an issue when my internet connection drops in the middle of an update and then my site crashes.
Do you have access to the database? If so, I suggest you deactivate all plugins using the database (first make a backup, if you can, just in case). To do that:
1. Log in to the database for your install
2. Locate the options table (i.e. wp_options)
3. Search for the “active_plugins” record
4. Click EDIT on that record
5. Delete (or copy/paste on notepad to use later, if needed) everything under “option_value”
6. Save
That should deactivate all the plugins.
Alternatively, you can also run this query:
UPDATE wp_options SET option_value = '' WHERE option_name = 'active_plugins';
But do that only if you feel comfortable doing this. ALWAYS BACKUP FIRST!
Hope this helps.