I found the file where throws the error (No existing trace found).

• https://github.com/openai/openai-agents-js/blob/main/packages/agents-core/src/tracing/context.ts

After I installed `@openai/agents-core` package, for I want to try some logic, everything start working and the error gone away.

I don't know why but all I did is "I installed `@openai/agents-core` package".

The problem was solved. thank you.