The response is not a valid JSON response

Hi
are you using any plugin to upload the images?

I upload directly when writting article in wordpress. Just click add image or media library and upload all and it shows me that error ocurred.

Okay here are some of the methods.

• Update Permalink
• Install Really Simple SSL and fix Mixed content with it.
• Update Gutenberg Plugin
• Use Classic Editor

Let me know if any of the above methods worked for you.