Error: an error occurred while building an item in the cart. To complete the order, edit the item and enter any missing information - when completing an unresolved online sales order

Sometimes in the unresolved online sales order, there will be an error: an error occurred while building an item in the cart. To complete the order, edit the item and enter any missing information. If you are unable to edit the item, remove it from the cart and re-create it.  Another similar error you may receive is: A ticket on this order is missing registrant information. To complete the order, please edit the event registration and enter the missing information

This usually indicates there is not a price type or registration option selected on the item in the cart.

This is caused by changing the price types, registration options, or membership levels on the event or membership while the event or membership is live on the web.  For example, the registration option was named Adult when they purchased online, but then it changed to Adult-Member.  This will cause the order to be put in Unresolved Online Sales orders since the registration option changed from what they originally purchased. 
  1. Go to Sales > Unresolved Online Sales Order.
  2. Open the Order.
  3. Click on View Unresolved Online Order Error.  See error: an error occurred while building an item in the cart. 
  4. Highlight the item and delete it out of the cart.
  5. Go to the Create Order tab and add the same event item back into the cart, but with the correct price type or membership details.
  6. Click Complete to finish the order.

Environment

 3.13

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