Bug report

Describe the bug

Serving an amp-enabled page returns the following error:

TypeError: this.sandbox.amp.validator.categorizeError is not a function

To Reproduce

Steps to reproduce the behavior, please provide code snippets or a repository:

1. Make an amp enabled page
2. Access the created page from browser
3. See error

Expected behavior

Expected to see working page

System information

• OS: macOS Mojave
• Browser: Chrome 77.0
• Version of Next.js: 9.1.1

Additional context

There is a release of amphtml-validator that apparently fix the problem, maybe the solution is to update the amphtml-validator version in package.json

Related issue on amphtml repo