Can't create Cover WP child theme

I’m very new to wordpress, like your theme, want to use it, with some modifications, am trying to create a child theme for it, using this code:
/*
Theme Name: Child of cover
Theme URI: http//www.?.com
Description: This is my first child theme
Author: john kimon
Template: coverwp
*/

The child theme appears among my available themes, but when I try to preview or activate it; all I get is a totally white screen, no text and no images as well as no style. Everything is wiped. Am I doing something wrong or is this something you’re aware of at your end? I’m using the same basic code and creating the same basic child theme folders in the wp-content/themes area with success; so don’t know what’s happening with Cover. Any ideas? I would like to use this theme.