BTC testnet not connecting on local development

I am following the basic bitcoin canister example here. And i wanted to run testnet network , on my local machine because i didn’t want to run the bitcoin regtest software . But now i am getting this error.

Request ID: 38d7259cee2e9c9f6aad81f264a881d06e284993ed8a0a7e3e027a3e186fda5b
Reject code: 5
Reject text: Canister bkyz2-fmaaa-aaaaa-qaaaq-cai trapped explicitly: Panicked at 'called `Result::unwrap()` on an `Err` value: (DestinationInvalid, "Canister g4xu7-jiaaa-aaaan-aaaaq-cai not found")', src/bridge_bitcoin/``

Here’s a few resources to try poking it:

I think the key line is dfx_start "--bitcoin-node" "" which you have to adapt to your own setup