Unknown paper format:

Error

Unknown paper format:

What it means

Puppeteer raised this from its Puppeteer runtime code. In practice, it usually means your script reached a browser, page, frame, element, or option state that the API cannot use safely.

How to fix it

• Use a known paper format such as A4 or pass numeric dimensions with units.
• Validate page.pdf() options and avoid unsupported parameter types.

Minimal guard

try {
  // Run the Puppeteer operation that triggers this error.
} catch (error) {
  if (error instanceof Error && error.message.includes("Unknown paper format:")) {
    // Apply the fix above, then retry or fail with a clearer message.
  }
  throw error;
}