CODE_ERROR

There is an error in the cadence code of this transaction.

[Error Code: 1101] error caused by: 1 error occurred: * transaction execute failed: [Error Code: 1101] cadence runtime error: Execution failed: --> 45a72bf3231966651f7626e5b0c6f8182366bb796dddf5f411a997ce7dcb8aec:36:10 | 36 | createListing(seller, storefront, request, paymentReceiver, nftRef, typeRef) | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ --> 45a72bf3231966651f7626e5b0c6f8182366bb796dddf5f411a997ce7dcb8aec:66:2 | 66 | storefront.createListing( 67 | nftProviderCapability: collectionCap, 68 | paymentReceiver: paymentReceiver, 69 | nftType: typeCache[r.nftTypeIdentifier]!, 70 | nftID: r.nftID, 71 | salePaymentVaultType: Type<@DapperUtilityCoin.Vault>(), 72 | price: r.price, 73 | customID: r.customID, 74 | expiry: UInt64(getCurrentBlock().timestamp) + r.expiry, 75 | buyer: r.buyerAddress 76 | ) | ^ error: assertion failed: nft cannot be nil --> 3cdbb3d569211ff3.NFTStorefrontV2:619:4 | 619 | assert(nftRef != nil, message: "nft cannot be nil") | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^