Error message when use word `filestore`

Hi @knojman,

Thanks for reaching out. I checked the issue by adding the code to a new page on my test website, but I could not replicate the issue. I was able to update the content & code on the page without any error messages.

The error message you see when updating or publishing the post, “The response is not a valid JSON response,” could appear for several reasons. However, the most likely cause of it is incorrect URL settings in WordPress or broken permalinks.

You can follow this guide to debug the issue on your site https://www.wpbeginner.com/wp-tutorials/how-to-fix-the-invalid-json-error-in-wordpress-beginners-guide/.

Best,