Hi @pipoulito,
Thanks for getting in touch. As you’re encountering a JSON error we’d be happy to investigate this further for you. The error you’re seeing within the Site Kit dashboard is a generic WordPress error, which may also appear elsewhere, such as a when saving a post. So we can provide you with the most suitable troubleshooting suggestions please share the following:
Let me know if you have any questions with the above. Once we have the above information we can troubleshoot this further.