Why does my Node.js program return 'No assistant found with ID' even with a valid assistant?

I'm running a Node.js application that continually returns the error "no assistant found with id". I've double checked the assistant ID and even recreated the assistant, but the error still persists.

I suspect there might be an issue with how the assistant ID is being handled, possibly related to environment variable configuration or deployment settings. Has anyone encountered this problem or can suggest what might be wrong?

For context, here is a snippet from the example code in the Assistant UI documentation where the assistant ID is fetched from an environment variable:

TSCopied
assistant_id: process.env.ASSISTANT_ID ??
(() => {
  throw new Error("ASSISTANT_ID is not set");
})(),

I'm eager to know if there are any known pitfalls or suggestions on how to resolve this issue.