Publishing or uploading failed. Error message: “The response is not a valid JSON response”

Please follow the below steps when you get the above error. You will get this error When you try to publish a post or create a new page in the wordpress site.

1. Go to settings>permalinks. Select “Post name” and save. Try updating your posts/pages. If it doesnot work, try selecting another option in the settings>permalinks.
2. If the 1st step doesn’t work then install the classic editor plugin. This should solve the issue. If it doesn’t work then goto the third step.
3. Goto your apache config file(mydomain.conf) and add the below lines.
   <Directory /var/www/html/>
   Options FollowSymLinks
   AllowOverride All
   Require all granted
   </Directory>
   Note:- Replace /var/www/html with your document root.

If the issue is not resolved after following the above three steps then we need to debug further.