AI_InvalidPromptError

This error occurs when the prompt provided is invalid.

Potential Causes

UI Messages

You are passing a UIMessage[] as messages into e.g. streamText.

You need to first convert them to a ModelMessage[] using convertToModelMessages().

import { type UIMessage, generateText, convertToModelMessages } from 'ai';

const messages: UIMessage[] = [
  /* ... */
];

const result = await generateText({
  // ...
  messages: await convertToModelMessages(messages),
});

Properties

• prompt: The invalid prompt value
• message: The error message (required in constructor)
• cause: The cause of the error (optional)

Checking for this Error

You can check if an error is an instance of AI_InvalidPromptError using:

import { InvalidPromptError } from 'ai';

if (InvalidPromptError.isInstance(error)) {
  // Handle the error
}