The error message you are seeing is in French, and it translates to “The update failed. The response is not a valid JSON response.” This error typically occurs when there is a problem with the server’s communication with WordPress or when there is a conflict with a plugin or theme.
To fix this issue, you can try the following steps:
Clear your browser cache and cookies and try updating again. If this doesn’t work, try using a different browser.
Deactivate all plugins and try updating again. If the update is successful, then you can reactivate your plugins one by one until you identify the plugin causing the conflict.
If deactivating the plugins did not solve the problem, try switching to a default WordPress theme like Twenty Twenty-One and try updating again. If the update is successful, then you may need to contact the theme developer for further assistance.
If none of the above steps work, you can try updating WordPress manually by downloading the latest version of WordPress from the official website and replacing the files on your server with the new ones.
It is always recommended to take a backup of your website before making any changes to your site.
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