When I Use "https://testnet.blockchain.info/unspent?active=" to get my UTXO on testnet I get this response：

Cannot deserialize instance of com.blockchain.haskoindata.blockchaindomain.BlockchainUnspentList out of START_ARRAY token at [Source: (okhttp3.ResponseBody$BomAwareReader); line: 1, column: 1]

Why? What can I do to resolve this?