PHP Fatal Error on Child Theme

Hi,

I currently am running the Child Theme Configurator (Version 2.0.3) using the Sela theme on my website.The configurator has an “analyze” child theme option to determine stylesheet dependencies and other potential issues prior to activating it. When I first analyzed the Sela theme before creating the child theme, it was fine. I ran the analysis again just after fiddling with a few things. Upon analysis, I am receiving the following error:

“Do Not Activate “Sela Child”! A PHP FATAL ERROR has been detected.

Debug Output:
Fatal error: Call to undefined method WP_Customize_Manager::is_theme_active() in /home1/thecurp4/public_html/wp-content/plugins/jetpack/modules/custom-css/custom-css.php on line 1335

You may not be able to use this Theme as a Child Theme while these conditions exist.
It is possible that this theme has specific requirements to work correctly as a child theme.”

I also am getting a few other errors but not as severe. Maybe this will provide additional insight.
1) This child theme does not load a Configurator stylesheet.
2) This child theme uses the parent stylesheet but does not load the parent theme’s style.css file.
3) This Child Theme has not been configured for this plugin.

From browsing the boards, I’ve come to the conclusion that it has to do with the jetpack but I’m not really sure how to solve this issue. I activated it in order to use the Site Logo feature. Also, I’m sure you can tell that I’m very new to this child theme ordeal but any help would be greatly appreciated.

Thank you!