Undefined index: use_standard_lightbox

Hey oneskysandy,

Sorry for the problem. I see that you are running an old version of the theme, could you try to update to the latest version (4.6.3.1) to see if that helps please? The update to 4.6.x has to be done manually from the version you are running, please refer to my replies in this thread: https://kriesi.at/support/topic/enfold-4-5-theme-update-update-failed-download-failed-a-valid-url-was-not-pro/#post-1021541

You can either update manually via FTP: https://kriesi.at/documentation/enfold/how-to-install-enfold-theme/#theme-update, or use a plugin to upload the theme zip file: https://wordpress.org/plugins/update-theme-and-plugins-from-zip-file/

If that doesn’t work then please try to delete the whole theme folder, then replace it with the new version. Make sure that you have backups of the site before starting updating.

After you have updated then try to activate the Classic Editor in the main page of the theme options.

Also please read this after you have updated: https://kriesi.at/documentation/enfold/theme-registration/

Best regards,
Rikard