I'm working on a transaction in Move language involving a purchase function for a kiosk, but I keep hitting an error indicating a type mismatch, specifically EFieldTypeMismatch: u64 = 2 from dynamic_field.move. I've tried using BUYER_KIOSK instead of BUYER, but with no success. The transaction script involves splitting coins, assigning to coin, making move-calls, and confirming requests, but it fails at remove_child_object. Could this error be due to the incorrect type for function arguments? How can I resolve this?

(\
PRICE="5000000000"; \
PACKAGE="0x4"; \
PURCHASE_COIN="0x5"; \
ITEM="0x6"; \
ITEM_TRANSFER_POLICY_TYPE="<0x2::transfer_policy::TransferPolicy<$PACKAGE::factory::Nft>>"; \
ITEM_TRANSFER_POLICY="0x7"; \
SELLER_KIOSK="0x8"; \
BUYER_KIOSK="0x9"; \
BUYER="0x10"; \
sui client ptb \
    --split-coins @$PURCHASE_COIN "[$PRICE]" \
    --assign coin \
    --move-call 0x2::kiosk::purchase "<0x2::kiosk::Kiosk>" @$SELLER_KIOSK @$ITEM coin.0 \
    --assign purchase_result \
    --move-call 0x2::transfer_policy::confirm_request $ITEM_TRANSFER_POLICY_TYPE @$ITEM_TRANSFER_POLICY purchase_result.1 \
    --move-call 0x2::transfer::public_transfer "<0x2::kiosk::Item>" purchase_result.0 @$BUYER \
    --gas-budget 1000000000 \
    --json\
)