Why I got this error when calling NewClientWithDefaultMainnet

```
networks := map[string]*liteapi.Client{}
var err error
networks["-239"], err = liteapi.NewClientWithDefaultMainnet()
if err != nil {
t.logger.Errorf("Error creating TON mainnet client: %v", err)
}
`````

the error response "Error creating TON mainnet client: invalid character '\u003c' looking for beginning of value","time":"2024-12-11T17:21:34+07:00"