Type error on checkout actions

[essteer]

The following error arises on the backend when attempting to checkout a cart from the frontend app:

WARN 433402 --- [vann] [nio-9001-exec-3] .w.s.m.s.DefaultHandlerExceptionResolver : Resolved 
[org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot deserialize Map key of type 
`java.util.UUID` from String "cartItems": not a valid representation, problem: (com.fasterxml.jackson.databind.exc.InvalidFormatException)
 Cannot deserialize Map key of type `java.util.UUID` from String "cartItems": problem: Invalid UUID string: cartItems]