unexpected response from testnet api

I sent a request to 'https://open-api-testnet.unisat.io/v1/indexer/inscription/info/cdb4ab74f5b17e4486eb4741c1ad19a732a56830db0da984e1cf93b4be8d4b01i0' and got an unexpected result as following:

```
{"code":-1,"msg":"get nft index failed","data":null}
```

as idea?
