Every theme I export for Wordpress zip file seems to be giving me an error message when uploading into Wordpress "The package could not be installed. The theme is missing the index.php file."

Hi, After a fresh installation of WordPress (5.4.1) and the latest Nicepage plugin, I get the following error message on my webpage: Notice: Undefined index: googleAnalyticsMarker...

Hi there, I've upgraded to NP version 2.2.4 yesterday and have created a website today to be exported and uploaded to a given WP. After uploading the ZIP file to WP (Appearance -> Themes -> Add New...