Transactionmetadata Cannot read properties of undefined (reading 'new')

Developers Transaction Metadata
1

Hi, help

const generalMetadata = Loader.Cardano.GeneralTransactionMetadata.new();
generalMetadata.insert(
Loader.Cardano.BigNum.from_str(“721”),
Loader.Cardano.encode_json_str_to_metadatum(JSON.stringify(metadata))
)
_metadata = Loader.Cardano.TransactionMetadata.new(generalMetadata);
rawTxBody.set_metadata_hash(Loader.Cardano.hash_metadata(_metadata));

error Cannot read properties of undefined (reading ‘new’)

Thank.