One or more WordPress plugins tried to call the WordPress REST API, which failed. Most likely a security plugin or a web server configuration disabled the REST API. Please make sure that the following REST API namespaces are reachable to use your plugin without problems:
What is the WordPress REST API and how to enable it? Learn more.
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The backup of this post in your browser is different from the version below.
This will replace the current editor content with the last backup version. You can use undo and redo in the editor to get the old content back or to return to the restored version.