Troubleshooting: HTTP error when uploading images
When you get an HTTP error when trying to upload an image in a Beaver Builder module, it's most likely due to a mismatch in forcing SSL on your site. If your site has an SSL certificate and your site's wp-config.php file contains the following line:
then make sure that you have also set both URLs in Settings > General to use
https:, as shown in the following screenshot.