how can I getUxtos on litecoin testnet

[Antornyh]

here is my code ,and it always return empyt.

var insight = new explorers.Insight('http://testnet.litecointools.com',explorers.litecore.Networks.testnet);

insight.getUtxos('n3pnH9YPjesmhQuTHrGtY3J9AX4XeraC9W', function(err, utxos) {
if (err) {
// Handle errors...
console.log(err)
} else {
// Maybe use the UTXOs to create a transaction
console.log(res)
}
});