The REST API encountered an unexpected result

When enabling Wp rocket plugin my site show this error

The REST API is one way that WordPress and other applications communicate with the server. For example, the block editor screen relies on the REST API to display and save your posts and pages.

When testing the REST API, an unexpected result was returned:

REST API Endpoint: https://www.sararoka.com/wp-json/wp/v2/types/post?context=edit
REST API Response: (503) Service Unavailable

Hello,

Could you please check how it works with some default WordPress themes like TwentyTwenty or WooCommerce Storefront to understand is it our theme issue or not?

Kind Regards

[Author]

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