vercel/next.js · error

Invalid ${configFileName} options detected:

Error message

Invalid ${configFileName} options detected: 

What it means

Header line of the aggregated config-validation report printed at the end of config loading: individual checks in assignDefaultsAndValidate can push non-fatal problems into a warnings list instead of throwing. When that list is non-empty it is rendered under this heading (each message indented), optionally routed through the onValidationMessages callback, followed by a link to the invalid-next-config docs.

Source

Thrown at packages/next/src/server/config.ts:2602

    // Group warnings first
    if (warnings.length > 0) {
      const warningMessages = [`Invalid ${configFileName} options detected: `]

      for (const error of warnings) {
        warningMessages.push(`    ${error.split('\n').join('\n    ')}`)
      }

      warningMessages.push(
        'See more info here: https://nextjs.org/docs/messages/invalid-next-config'
      )

      // Call the callback with validation messages if provided
      if (onValidationMessages) {
        onValidationMessages(warningMessages)
      }

      for (const message of warningMessages) {
        warn(message)
      }
    }

    // Then throw hard errors
    if (hasFatalErrors) {
      await flushTelemetry()

      const errorMessages = [
        `Fatal next config errors found in ${configFileName} that must be fixed:`,
      ]

      for (const error of fatalErrors) {
        errorMessages.push(`    ${error.split('\n').join('\n    ')}`)
      }

      errorMessages.push(
        'These configuration options are required or have been migrated. Please update your configuration.'
      )

View on GitHub (pinned to 258b1c1bc0)

Solutions

1. Fix or remove the invalid options in your next.config file as listed in the warning output.

When it happens

Trigger: Thrown at packages/next/src/server/config.ts:2557 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of vercel/next.js@258b1c1bc0 (2026-08-19). Data as JSON: /api/errors/c9f2e5350a1873c3. Report an issue: GitHub.