Child Theme Problem

I am trying to build a child theme for my website, but I am getting the error:
“Broken Themes

The following themes are installed but incomplete. Themes must have a stylesheet and a template.

Name Description
Monstroid Child The “monstroid” theme is not a valid parent theme.”

What is wrong with my style.css?

/*
Theme Name: Monstroid Child
Theme URI: http://www.templatemonster.com/wordpress-themes/monstroid/?utm_expid=86254754-41.IB_qpu_-R12VyvHjJYneww.0&utm_referrer=http%3A%2F%2Fwww.templatemonster.com%2Fwordpress-themes%2Fmonstroid%2F#updates
Description: Monstroid Child Theme
Template: monstroid
Version: 1.0.5
Author: Template Monster
Author URI: http://www.templatemonster.com/
*/