Original link: https://www.wpdaxue.com/how-to-fix-invalid-json-errors-in-wordpress.html
During the use of the Gutenberg block editor, the Invalid JSON error condition occurs when WordPress cannot communicate with the web server. Today we’ll show you how to find and fix problems. In our experience, it is usually possible to check by following these steps: Find out if something simple is the cause of the error. Check your WordPress URLs and change them if necessary. Adjust your permalink settings, or at least rebuild them. Check out the site health page in WordPress for clues on how to proceed. Rebuild your .htaccess file. 1. Follow some simple steps to diagnose the error
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