"Unable to add item" and "that item is not available" error for no reason

Squarespace recently fixed a bug where products on disabled Products Pages could be added to the cart – previously, if you had a product on a disabled Products Page shared elsewhere on your site (in a Product Block or Summary Block, or linked directly to the URL), the product could be purchased. If you're noticing products can no longer be purchased, double-check that the Products Page is enabled (you can move it to your Not Linked Pages to keep it from appearing in your navigation.

@oquay @kevinlh @booking

I'm having the same problem.

Same here! Haven't changed anything in months and the error just started on its' own. Losing potential orders :((

Well I haven’t faced the same issue but it is a bit similar. In my case, I was receiving this “Item Cannot Be Found In The Collection” error in my Access database.

After deep research I have found that this error mainly arises due to :

1# Missing Field

2# Issue In The Database Upgrade Script

3# when the Database Is Not Updated Properly

4# Similar Version Of Database And Workstation Installation

5# Connection Is Set Up With The Wrong Database

Read more at: Access Item Cannot Be Found In The Collection error