Failed to load assistants

When installing the repo and starting the UI service at https://smith.langchain.com/studio/?baseUrl=http://127.0.0.1:2024 gives an error:

Failed to load assistants Please verify if the API server is running or accessible from the browser. TypeError: Load failed

The documentation endpoint methods work however at http://127.0.0.1:2024/docs

Terminal logs are also OK:

How to fix this?