PC gamers are unable to buy Hollow Knight Silksong on Steam, as it is constantly leading to a “cannot add to cart” error. Here’s how to fix it.

Users on Steam are unable to purchase Hollow Knight Silksong, as Steam is constantly throwing up the “cannot add to cart” error. Gamers are taking to Reddit and X to express their frustration and find out if others have found a possible solution. We kind of expected this. After all, gamers have been waiting for Hollow Knight Silksong for a long time, and its huge demand has overloaded the Steam client. This resulted in the said error.
Fortunately, we have some solutions for you that you can try. Read on to learn more.
Note: Parts of this article are subjective and reflect the writer’s opinions. The fixes provided below are not guaranteed to work for everyone.
Fixes for Hollow Knight Silksong “cannot add to cart” Error
1) Restart the Steam Client
It is possible that due to the huge demand and load on the Steam servers, the Steam client on your PC is unable to authenticate. Restarting the client should fix the issue. Follow these steps to restart the client:
- Right-click on the Steam icon in the system tray of your PC.
- Next, click on the Exit Steam button.
- Next, select Yes and let the Steam client close.
- Once that’s done, press Windows + S.
- Type Steam and press Enter.
The restart operation is successful. Once the Steam Client fully loads, try adding Hollow Knight Silksong to your cart and proceed to checkout immediately.
2) Flush DNS

Flushing the DNS clears out any custom DNS configurations you may have previously tried. They could conflict with Steam and trigger the error, so it’s necessary to clear them. Here’s how to flush DNS on your PC.
- Right-click on the Start Menu and choose Windows Terminal/PowerShell (Admin).
- Click Yes when Windows asks for admin rights.
- Type ipconfig /flushdns and press Enter.
After this, restart your PC and try purchasing Hollow Knight Silksong again. The “cannot add to cart” error should disappear now.
3) Sign Out of the Steam Client and Sign In Again
Signing out and signing in again will force the Steam client to reauthenticate your account with Steam servers, which should fix this issue. Here’s how to do it:
- Click on your account name/icon in the top-right corner of the Steam client.
- Select “Sign out of account” and click Confirm.
- Once you are signed out, enter your details again and sign in again.
This should finally fix the “cannot add to cart” error. However, if you still experience this, you will just have to wait for the Steam servers to be fixed.
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